Chemistry

📢 WICHTIG 📢 Diesmal organisieren wir das Treffen draußen, im Tilla-Durieux-Park gegenüber The Playce in Potsdamer Platz. Wir sitzen auf dem Gras, wo der Boden flach ist. Wenn möglich bring bitte Picknickdecken mit.

Join us for a daily chess meetup in the heart of Berlin at Schönhauser Allee 174. Whether you're a beginner or a seasoned player, feel free to drop by anytime between 7 PM and midnight, every single day of the week. No registration is required – just show up and enjoy a game in a fun, inclusive, and casual environment. Newcomers can take advantage of a friendly crash course to get started, while experienced players share strategies, discuss best practices, and even explore quirky variants like Duck Chess or Bughouse. Boards, sets, and clocks are provided, with time controls up to 10 minutes per player for a rapid, engaging experience. It’s the perfect way to unplug, detox from screens, and connect with a diverse, kind-hearted community of chess lovers. The gathering welcomes all levels and backgrounds, creating a vibrant, family-friendly space where everyone can enjoy the game and forge real connections.

Let‘s get together for BBQ and Karaoke at Monbijoupark! We bring the grill, the speaker and the mikrophones and we bring a bunch of food and beers but if you would also bring some food or drinks or a tip it would be much appreciated and amazing but not necessary. Btw, theres a Späti close by, in case anyone wants to buy more drinks. Looking forward to seeing yall. 🎉🎉🎉 join our whatsapp group https://chat.whatsapp.com/CHrsN4T1Bz2EdtyxjDTffh?mode=gi_t

1 EURO DONATION FEE PER PERSON IS REQUIRED (on site, in cash), to pay back the Meetup subscription fees and support my Events. READ THE DESCRIPTION WITH THE INFO (IMPORTANT). WHATSAPP LINK BELOW 📳​ We meet at Grunewald S Bahn station at 14 o'clock 😀🚉 I wait till 14,10 and for everyone, then we start to walk to Teufelsberg 🗼 (it is 2,2kms far away from the station, and we will walk in the Grunewald woods 🌳): https://maps.app.goo.gl/6ktBwGeASxSpf14d6 Teufelsberg is a former listening station 📻 of the West Germany, where now is possible to meet both the History of the place (with some exhibitions too) and art (a lot of wonderful Graffitis 🖌️🎨 are now there): https://www.teufelsberg-berlin.de/en/visit/important-informations/ In addition to the place itself, 2 temporary exhibitions are now present, as you can read on the website. **Ticket cost: 12 euros (10 euros reduced)** You can buy the ticket online or on site Bring your own food🍔 and drinks🥤(in Teufelsberg there are anyway some bar, coffee and food tracks ☕🍔) We will arrive at Teufelsberg around 14,40 and my plan is to stay there 3 hours or even more (both to see the place and the exhibitions and to stay there together to eat and drink and relax). We can then spontaneously decide to stay together even longer after Teufelsberg, going to some bar (there is a Bistro in Grunewald 🍲) or restaurant. Everyone is, in any case, free to stay for a longer or shorter time. I do not provide a "personal support" for people who arrive at Grunewald S Bahn station after 14,10 o'clock You are responsible to check for the weather and decide if come or not. Thanks for understanding. If you have to contact me, make it via Whatsapp, not here on Meetup. WHATSAPP COMMUNITY 💬 to find each other (join it, we use this group to find and synchronize us, as well as post photos) [https://docs.google.com/document/d/157uLVXObKt1a4NqqvPa09NJW-050YBwHLW-7DbOD8R8/](https://docs.google.com/document/d/157uLVXObKt1a4NqqvPa09NJW-050YBwHLW-7DbOD8R8/)

Berlin is slowly slipping into summer again — longer evenings, warmer air and the feeling that staying home might mean missing something. Join us for a Monday night full of conversations, new faces and a little bit of early summer energy before the city gets too busy to notice itself. ✨ Tiny optional challenge: Bring one small thing that feels like summer in Berlin to you. A photo, an object, a snack, sunglasses, a book, a strange souvenir — anything with a story behind it. Orga The location accepts only card payments. We will be sitting in the first room. Questions? Check our Meetup-FAQs: [https://socialbutterfly.berlin/meetup-faq/](https://socialbutterfly.berlin/meetup-faq/) Meet your host I’m Julia — a Berlin local who loves bringing people together. My path went from growing up in a dance school to studying philosophy to working in IT support, and somehow all of that led me here: hosting meetups and creating spaces where people can show up, relax, and connect. Insta [https://www.instagram.com/juwaberlin/](https://www.instagram.com/juwaberlin/) LinkedIn [https://www.linkedin.com/in/julia-waehnert/](https://www.linkedin.com/in/julia-waehnert/) About The Social Butterfly Club 🦋 is a Berlin-based community that has been bringing people together for over three years. Each gathering is part of a larger framework designed to help friendships grow through shared experiences in the city — with a long-term vision of turning Berlin itself into a shared, playful experience. Love the vibe? There’s a whole community waiting for you. 🦋 Join the Social Butterfly Club and experience Berlin together [https://socialbutterflyradar.substack.com/](https://socialbutterflyradar.substack.com/)

**👋 Hello Strangers! —** For all players and chess-curious folks out there who want to chill, make friends, and enjoy some chess: We are hosting a daily meetup in Mitte / Prenzlauerberg for all experience levels. It doesn't matter if you just watched the Queen's Gambit or if you have been playing regularly for a while. **Join us** — Daily from 7 pm till midnight. **Expected Behavior** — [Conduct](https://strangerchess.com/conduct/) **Pics** · [Instagram](https://www.instagram.com/strangerchess/) / **Chat** · [Telegram](https://t.me/strangerchess) / **Web** · [Strangerchess.com](https://strangerchess.com/) (No need to bring anything, boards, clocks, etc. are provided)

🕢 Doors open at 18:30 and sessions start at 19:00. Freestyle vocal workout at and play session. €8-20 😌 Flow is a state of being… an experience when you allow yourself to be 100% fully engaged in the present moment in a feedback loop between clarity and satisfaction. It is an undeniable sensation where things seem to be more effortless, pleasurable, in sync, and you can easily sense a connection with something greater than yourself; this is what we will create…: • a connected and mindful meditation where it is possible to blissfully surf the cutting edge of the present moment together… • a game where it’s possible to feel excited and calm in the same moment, and everyone can win as much as they like… Scott Bolden, founder of Das Baumhaus Berlin will share some very easy, practical and effective methods developed during the last 12 years of facilitating the “Improvisational Groove Orchestra” (I.G.O.) improv vocal jam sessions. Within 20 minutes participants learn to use the common sound space to create resonance in the form of improvisational music where it is quite common to experience some real flow moments… It is very easy to participate, no musical talent or training is required so anyone is welcome to join. All of the session is done with eyes closed to avoid visual distractions and keep focus on the co-created sound space. During these sessions we will also have short breaks for feedback and refreshment. Important – Please be on time. It is very important to understand the methodology and warm up in the group before joining in! 🎤 @21:00 - Freestyle vocal workshop and practice session. €8-15 Have you ever wanted to learn how to do freestyle vocalizations? Maybe you are on your way and would like to just have a fun workout session with other vocal freestyle enthusiasts. All levels welcome. Links to sound samples - https://www.baumhausberlin.de/events/flow-a-guided-vocal-sound-bath-meditation/

**⚠️ IMPORTANT: REGISTRATION MANDATORY ⚠️** Registration on **Luma** is **REQUIRED** to attend this event. **Link: https://luma.com/1sre8dy7?utm_source=meetup** Your registration is subject to host approval. You must complete the registration process on lu.ma to receive the full event location details and confirmation of your attendance. **Please note: Without approved registration on Luma, you will NOT be able to access the event location or attend.** We are excited to host a **BLISS x dida workshop** featuring **Lazar Obradović (Lead Data Scientist @ cognee.ai)**, who will guide us through an interactive session on Agentic AI. ​Title: Explainable Scientific Discovery with AI Memory: Hypothesis Generation and Validation with Cognee and Bayer 📅 Date: 27.05.2026 🕕 Time: 18:00 📍 Location: TU Berlin Marchstrasse 23 [Room 0.011] ​The session will last around 2 hours, followed by a networking session with dida and fellow AI enthusiasts (and free pizza!🍕). Bring your laptop! **​Abstract: Building "AI scientist"** systems that can reliably generate and evaluate research ideas remains effectively an open problem. While LLMs make hypothesis generation cheap, current systems still struggle to connect evidence across papers, domains, and mechanisms in a structured and reusable way. Evaluation is equally difficult, often relying on opaque “LLM-as-a-judge” methods that are hard to interpret or reproduce. We use Cognee to ingest scientific literature and construct a graph-based representation of papers, claims, and entities with associated vector embeddings. We then use this structure to select and organize the context used for hypothesis generation. Candidate hypotheses are evaluated using explicit graph- and vector-based metrics grounded in the underlying corpus. Initial evaluations by Bayer across targeted biomedical domains demonstrated that graph-based AI memory can reliably support scientific hypothesis generation and validation. **⚡ FINAL REMINDER ⚡** **You MUST register and be approved on Luma to attend. The event location will only be visible after your registration is confirmed by the host. Link: https://luma.com/1sre8dy7?utm_source=meetup** *** We are **BLISS e.V.**, Berlin’s AI community connecting like-minded individuals passionate about machine learning and data science. Our **BLISS Workshops** connect **students and young professionals with industry partners**, offering an inside look into **how machine learning is applied in real-world settings** \- from research and development to deployment\. ​We are **dida**, scientific engineers who believe that **reliable AI** should not be a **"black box".** That is why we prioritize transparency, mathematics, and code over hype. By **bridging the gap between theoretical research and production**, we develop custom white-box AI solutions that are fully explainable, rigorously engineered, and free of "magic". ​​​dida Website: [https://dida.do](https://dida.do/?utm_source=luma) ​​dida Youtube: [https://www.youtube.com/@dida-do](https://www.youtube.com/@dida-do?utm_source=luma) ​​​BLISS Website:[ https://bliss.berlin](https://bliss.berlin/?utm_source=luma) ​​​BLISS Youtube:[ https://www.youtube.com/@bliss.ev.berlin](https://www.youtube.com/@bliss.ev.berlin?utm_source=luma)

Die Treffen finden hybrid statt, also online und vor Ort. Den Link für meinen digitalen Raum schicke ich am **Tag des Treffens** per Meetup-Mail an alle Teilnehmerinnen - schaut also bitte in euer Postfach bei Meetup! :-) Wir werden lesen, diskutieren, Erfahrungen austauschen, voneinander lernen und uns mit Themen kritisch auseinander setzen. Mitbringen braucht ihr nur das jeweilige Buch. Euch erwartet ein hoffentlich geselliger, inspirierender und unterhaltsamer Abend. Zum 28.05. lesen wir "Issa" von Mirrianne Mahn. Ich freue mich auf euch!

The next **Berlin C++ Meetup** hosted by think-cell takes place on **Tuesday, May 26**. Join us for an evening with the Berlin C++ community! This meetup is a chance to step away from your day to day work, meet other developers, exchange ideas, and have real conversations about modern C++ in a relaxed setting. \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- ## **Talk** ### **Contract assertions on virtual functions** *Timur Doumler – Citadel Securities* Contracts assertions were introduced in C++26, but they cannot be applied to virtual functions. To close this gap, we first need to answer the question: how should contracts assertions behave in the presence of inheritance and runtime polymorphism? In this talk, Timur explores why this problem is harder than it looks. He reviews existing approaches from other languages, such as Eiffel, D, and Ada, highlights why they don’t fully translate to C++, and outlines the key design challenges involved. He then presents a concrete proposal for how contract assertions on virtual functions could work in C++, balancing correctness, safety, and usability. Along the way, the talk touches on good API design, the true meaning of the Liskov substitution principle, and how to reason about program correctness. \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- 📅 **Date & Time:** Tuesday, May 26, 2026 – 18:30–21:30 📍 **Location:** Le Wagon Coding Bootcamp, Rudi-Dutschke-Straße 26, 10969 Berlin 🕒 **Agenda** 18:30 – Doors open 19:00 – Talk + Q&A 20:40 – Pizza, Drinks and Networking \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **RSVP now to save your seat!**

**👋 Hello Strangers! —** For all players and chess-curious folks out there who want to chill and make friends: We are hosting a daily chess meetup in Mitte / Prenzlauerberg welcoming all experience levels. It doesn't matter if you just watched the Queen's Gambit or if you have been playing regularly for years – join us Daily from 7pm till midnight. **Pics** · [Instagram](https://www.instagram.com/strangerchess/) / **Chat** · [Telegram](https://t.me/strangerchess) / **Web** · [Strangerchess.com](https://strangerchess.com/) (No need to bring anything, boards, clocks, etc. are provided)

Bring a blanket, maybe a drink or snack, and 3–5 books you’d like to pass on, and spend a relaxed Sunday afternoon with fellow readers at the Gleisdreieck Park. Novels, philosophy books, poetry, comics, forgotten favorites — in any language — everything is welcome. Maybe you’ll leave with fewer books — or more. Both are part of the adventure. This is not a formal market or networking event — just a cozy little community gathering with books, conversations, and a bit of curiosity. Come browse, swap, chat, or simply enjoy the atmosphere on the grass. Orga The meetup will only take place when the **weather is good**. Please keep an eye on notifications. This meetup is donation based. Your contribution helps keep this community alive and is highly appreciated. You can either contribute in cash or via Buy me a Coffee: [https://buymeacoffee.com/butterflyradar](https://buymeacoffee.com/butterflyradar) Questions? Check our Meetup-FAQs: [https://socialbutterfly.berlin/meetup-faq/](https://socialbutterfly.berlin/meetup-faq/) Meet your host I’m Julia — a Berlin local who loves bringing people together. My path went from growing up in a dance school to studying philosophy to working in IT support, and somehow all of that led me here: hosting meetups and creating spaces where people can show up, relax, and connect. Insta [https://www.instagram.com/juwaberlin/](https://www.instagram.com/juwaberlin/) LinkedIn [https://www.linkedin.com/in/julia-waehnert/](https://www.linkedin.com/in/julia-waehnert/) About The Social Butterfly Club 🦋 is a Berlin-based community that has been bringing people together for over three years. Each gathering is part of a larger framework designed to help friendships grow through shared experiences in the city — with a long-term vision of turning Berlin itself into a shared, playful experience. Love the vibe? There’s a whole community waiting for you. 🦋 Join the Social Butterfly Club and experience Berlin together: [https://socialbutterflyradar.substack.com/](https://socialbutterflyradar.substack.com/)

**👋 Hello Strangers! —** For all players and chess-curious folks out there who want to chill, make friends, and enjoy some chess: We are hosting a daily meetup in Mitte / Prenzlauerberg for all experience levels. It doesn't matter if you just watched the Queen's Gambit or if you have been playing regularly for a while. **Join us** — Daily from 7 pm till midnight. **Expected Behavior** — [Conduct](https://strangerchess.com/conduct/) **Pics** · [Instagram](https://www.instagram.com/strangerchess/) / **Chat** · [Telegram](https://t.me/strangerchess) / **Web** · [Strangerchess.com](https://strangerchess.com/) (No need to bring anything, boards, clocks, etc. are provided)

**The TypeScript Berlin meetup is back!** After a long break, we're reviving the meetups for 2026 and we'd love to see you there. Whether you've joined us before or you're coming for the first time, welcome! Come round for talks, snacks, good conversations, and a chance to connect with other TypeScript devs in Berlin. *** **🎙️ Interested in speaking?** We have an ongoing call for speakers for this event as well as future ones. [Fill it out here](https://tally.so/r/jaGa1J). *** **📅 Schedule** * 18:30 - Doors open, drinks and snacks 🍕 * 19:00 – Welcome 🤝 * 19:05 - Talk 1: TBC 🎙 * 19:35 - Talk 2: TBC 🎙 * 20:05 - Break 🥤 * 20:20 - Talk 3: TBC 🎙 * 20:50 - Wrap-up * 21:00 - Doors close 👋 *** This meetup is organised by [Prisma](https://www.prisma.io/). By attending the event, you agree to abide by our [Code of Conduct](https://www.prisma.io/event-code-of-conduct). For questions, reach out to events@prisma.io

This is a time where players of all ages, and skill levels can gather and enjoy a nice Sunday full of Chess!

Let’s meet and wander the galleries! General admission on Sundays is free.

Jimmy V's Grill & Pub in Grandview Heights. You are responsible for your own meal/drinks. We usually don't have any agenda other than eat, drink and talk. :) If the weather is nice we will be on the back patio, otherwise we are in the cigar room. This group has been meeting every Tuesday evening for over a decade. Many attendees do not RSVP on meetup. Please don't let the small number here discourage you. Anyone/everyone is welcome to come. We'd love to have you join us. COTA bus #5 comes to W. 5th and Wyandotte Rd. And it's a minute walk to the restaurant.

**History** The [Franklin Park Conservatory](https://www.fpconservatory.org/)’s roots trace back to 1852 when the Franklin County Agricultural Society purchased 88 acres of land to host the Ohio State Fair. After the fair moved to its permanent home, the city of Columbus transformed the grounds into Franklin Park in 1884. This transition shifted the space from a temporary event site to a dedicated public green space for the growing community. The park became a central hub for outdoor recreation and early civic gatherings in the neighborhood. In 1895, the landmark Victorian-style Palm House opened its doors, drawing heavy inspiration from the Glass Palace of the 1893 World’s Columbian Exposition in Chicago. This iron and glass structure became an immediate icon, housing exotic plants that residents would otherwise never see in the Midwest. It remains the oldest part of the facility and serves as a primary link to the conservatory’s 19th-century origins. For decades, it stood as a singular testament to grand horticultural architecture in Central Ohio. A major turning point arrived in 1992 when Columbus hosted AmeriFlora '92, an international horticultural exhibition. This massive event prompted a $16 million renovation and expansion, adding significantly more greenhouse space and the Dorothy M. Davis Showhouse. The festival put the conservatory on the international map and fundamentally changed its scale and ambition. Following the event, the facility transitioned from a city-run park to a private, non-profit organization. In 2003, the conservatory’s identity was further defined through a long-term partnership with world-renowned glass artist Dale Chihuly. After a successful exhibition, the Friends of the Conservatory purchased most of the glass installations, creating the largest permanent collection of Chihuly’s work in a botanical setting. These vibrant glass sculptures are now woven throughout the biomes, blending art with nature. This addition helped cement the conservatory as a premier cultural destination rather than just a botanical garden. Recent years have seen the site expand beyond the glass walls to emphasize community engagement and outdoor education. The 2018 opening of the Scotts Miracle-Gro Foundation Children’s Garden added two acres of interactive landscape designed for hands-on learning. The Scotts Miracle-Gro Company Community Garden Campus also provides local residents with space to grow their own food and learn sustainable practices. Today, the conservatory balances its historic Victorian charm with modern commitments to local ecology and the Columbus community. **Maps of the Conservatory** Here is the [main map](https://www.fpconservatory.org/wp-content/uploads/2025/08/franklin-park-zones-scaled.jpg) of the Conservatory grounds. Here's a [map of the areas](https://www.fpconservatory.org/wp-content/uploads/2026/02/ConstructionMap-2026.jpg) in which the Conservatory has ongoing construction (see below). **Summary** For this event, we'll explore Columbus's highly-rated and very popular Conservatory. As mentioned above, the Conservatory is doing renovations on parts of the facility. These renovations are scheduled to be ongoing until the Fall of next year. Basically, no matter when you go to the Conservatory over the next 18 months, you're going to see some metaphorical orange barrels. So let's just go now. **Tickets and pricing** On the first Sunday of every month, the Conservatory is free for residents of Franklin County and the city of Columbus. You must bring an ID to receive this discount. (Yes, they do check.) Otherwise, tickets are $25.20. Members of the Columbus Zoo (of which I am one) do get a discount on tickets, though I have never actually bought a ticket to the Conservatory (I've always gone on free days). I believe the discount is $4. Parking is always free. If you have additional questions about pricing or whether and for what you qualify, you can reach the Conservatory at 614-715-8000. **Where we'll meet** We will meet just outside the main entrance. I guarantee there's going to be a line. The Conservatory is always popular on free days, and especially in nice weather. **Your GPS is stupid!** Be careful simply typing "Franklin Park Conservatory" in your GPS and going where it tells you. The only way to access the parking lot to the Conservatory is off of Broad Street. Unfortunately, since Google Maps is unable to find its way out of a wet paper bag, it has a tendency to want to take people to a mythical, non-existent Conservatory entrance on Nelson Road. If your GPS does this, just drive to the north side of the Conservatory along Broad Street. Your GPS should then redirect you to the main Conservatory entrance. If your GPS doesn't, then throw your phone away\* and look for the big Conservatory sign on the south side of Broad Street between Nelson Road and Franklin Park West. You also should be able to use the map pin I've provided, below, and it should properly direct you to where you need to drive. \* Don't really do this. **After the event** After stopping to smell the roses, for those that are interested, we'll head to the nearby [Columbus Brewing Company Beer Hall](https://columbusbrewing.com/location/beer-hall/) for [drinks](https://columbusbrewing.com/location/beer-hall/#draft-list) and [lunch](https://columbusbrewing.com/location/beer-hall/#food-menu). The Beer Hall's actual address is [200 Kelton Ave, Columbus, OH 43205](https://www.google.com/maps/place/200+Kelton+Ave,+Columbus,+OH+43205/data=!4m2!3m1!1s0x883889a94ac4acad:0xadb2e60240dbc38b?sa=X&ved=1t:242&ictx=111) (it's literally just on the south side of the Conservatory). Be sure this is where your GPS is taking you when you use it, as the Brewing Company has a taproom on Harrison Avenue that is *not* what you want for this event. We should be at the Beer Hall by 1 if you can't make the Conservatory and just want to join us for drinks.

Christians in Tech is a community at the intersection of faith and technology. Our meetups are designed to spark meaningful conversations, promote knowledge sharing, and encourage growth—both in your career and your spiritual walk with God. Whether you're an experienced professional or just starting your tech journey, CIT welcomes you. Our Website [https://linktr.ee/citcbus](https://linktr.ee/citcbus) Sponsors and Partners * Improving (Venue Sponsor) * Bethel World Prayer Center (Fiscal Sponsor) * Fruits & Roots (Coffee Partner)