Cryptography

Join the Bitcoin District Book Club! We meet every month to explore new and exciting rabbit holes by reading books that are popular with bitcoiners. Join us for a deep dive into End Times: Elites, Counter-Elites, and the Path of Political Disintegration by Peter Turchin. In this thought-provoking session, we’ll explore the structural forces that have historically led to societal instability—and why Turchin believes we are entering such a period today. Drawing on his work in “cliodynamics” (the quantitative study of history), Turchin examines cycles of rising inequality, elite overproduction, and political fragmentation. We’ll discuss how internal competition among elites and growing public discontent have repeatedly destabilized societies—from ancient Rome to modern America—and what this might mean for the decades ahead. For those interested in macro trends, power structures, and long-term societal patterns, this book offers a compelling framework for understanding today’s increasingly chaotic world. Buy the book on [Amazon](https://a.co/d/097mab73) **Event Notes:** * Discussion Starters: We’ll kick things off with a few key questions around elite dynamics and societal cycles, but feel free to bring your own perspectives. * Future Reads: Let us know if you have recommendations for future book club selections! We’ll add them to the list posted on our website. * Afterwards: Feel free to join us at Pubkey after the meeting to hang out, continue the conversation, and grab some food! **Getting There:** * 🔴🟢🟡 Gallery Place/Chinatown + 2 min walk * Parking: Street & garage parking available nearby

Security cleared professionals please join us for the in-person All Clearances Cleared Job Fair, Thursday, April 16, from 2pm – 5.30pm at the Westin Tysons Corner. Whether you’re between contracts, transitioning out of the military / government, or just casually looking around, please join us for this in-person event. Our hiring employers include Amentum, Applied Research Laboratory at the Penn State University, AT&T, Core4ce, E-infosol, Leidos, PCI Federal, PingWind, System High, Teksynap, Tom Sawyer Software and more. Opportunities for Intel, Program and Project Managers, Data Scientists, Cyber, Geospatial, Malware Analysts, Malware Programmers, Software Engineers and Developers, CNO Engineers and Analysts, Database Administrators, System Administrators, Software and Application Developers, Network Designers and Engineers, Help Desk, Trainers and more. For more info and to pre-register visit: [https://clearedjobs.net/events/all-clearances-cleared-job-fair-westin-7801-leesburg-pike-falls-church-virginia-8?utm_source=event+posting+april+16%2C+2026&utm_medium=share&utm_campaign=job+fair&utm_term=april+16%2C+2026](https://clearedjobs.net/events/all-clearances-cleared-job-fair-westin-7801-leesburg-pike-falls-church-virginia-8?utm_source=event+posting+april+16%2C+2026&utm_medium=share&utm_campaign=job+fair&utm_term=april+16%2C+2026)

Discover the power of your breath to manage your mind and experience instant peace & calm. Join a 60-minute free Workshop and get a glimpse of the Sudarshan KriyaTM- The breathing technique that is revolutionizing the lives of millions. What you’ll discover at ‘Beyond Breath’ ✔ A taste of the Sudarshan KriyaTM, a breathing technique taught in the Happiness Program ✔ An instant energy booster that awakens & relaxes your mind - Take it home and practice daily! ✔ The peace & calm of a unique guided meditation ✔ Secret keys to manage your mind ✔ The power of surrounding yourself with positive, like-minded people. You can use your breath to master your thoughts and emotions - the key to managing the quality of your day. The Happiness Program At the end of this workshop you may enroll into the Happiness Program (3 days, 3 hours each day) to learn the Sudarshan KriyaTM, a science-backed, rhythmic breathing technique through which you can: Tap into a reservoir of energy and use it as you please! Relieve deep-rooted stresses and anxieties Uplevel your productivity Overcome emotional blocks, move on from past events and shed limiting beliefs Heal your body & gain power over your mind Experience the true state of meditation Learn more about the Happiness Program & the Sudarshan KriyaTM in our introductory workshop 'Secrets to Meditation'. Instagram: artoflivingDMV aolf.live/secretstomeditation

Come play some casual Commander at Crystal City! Bring your favorite decks for some pickup games, and feel free to bring your trade binders if you'd like! **We play at 2100 Crystal Drive** in Arlington, VA, 22202, which is a seating area that is right next to We, the Pizza in Crystal City. Detailed directions on how to get there: **Directions from the Metro:** If you're taking the Metro, exit at Crystal City. When you come up the first set of escalators, turn left to enter the underground shops and then turn left again after a brief walk. Cross the street, enter the next building, and the seating area will be on the left after passing the Minuteman Press Printing and Marketing shop. **Parking:** If you're driving, garage parking is free after 4 pm. Enter the garage on 2144 Crystal Drive. There will be elevators that take you up to the main level. If you have any questions, please join our Discord for the most up-to-date information: https://discord.gg/fBUWvrAVMv

• What we'll do On https://blackecon101.podbean.com/ Thursdays at 6 pm. discussing the economy....

THIS CLASS IS OFFERED THROUGH CAPITAL PHOTOGRAPHY CENTER **PLEASE REGISTER WITH CAPITAL PHOTOGRAPHY CENTER, NOT MEETUP!** https://capitalphotographycenter.com/classes/class/2026-04-19-sculpting-photos **Sculpting Photos** The sculptures in the west wing National Gallery of Art offers photographers a unique creative challenge: The art is already shaped by light, form, and intention. In this class we will explore how photography can re-imagine three-dimensional works through thoughtful observation and creative choices. By paying close attention to light, shadow, texture, and perspective, photographers can reveal new interpretations of sculptures, highlighting details, moods, and relationships that may not be immediately visible to the naked eye. Through guided looking and hands-on practice in the galleries, students will learn how camera position, framing, depth of field, and timing transform solid, static objects into dynamic photographic images. Whether isolating a gesture, emphasizing scale, or experimenting with abstraction, this class encourages photographers to move beyond documentation and toward personal expression, using sculpture as a powerful starting point for visual storytelling. Whether you’re new to photography or looking to deepen your practice, this class invites you to see the sculpture and your creative process in fresh ways. In this class you will learn to: 1. Develop observational skills by learning to analyze sculpture in terms of form, space, light, and texture, and translating those observations into intentional photographic choices. 2. Explore creative photographic techniques such as framing, perspective, and selective focus to reinterpret sculptures and create expressive, original images in an indoor museum setting. 3. Build visual storytelling skills by using photography to convey mood, movement, or meaning, helping students articulate a personal response to sculptural works. All cameras are welcome, from your smartphone to DSLR. However, we recommend the camera you use has multiple lenses or a zoom, and ability to adjust exposure. Lenses in the range of 28mm to 200mm would be appropriate. No flash or tripod since we'll be in a museum. Questions can be directed to Marie Joabar at info@capitalphotographycenter.com. Class limit: 8-9 *** **THIS CLASS IS OFFERED THROUGH CAPITAL PHOTOGRAPHY CENTER** https://capitalphotographycenter.com/classes/class/2026-04-19-sculpting-photos

Title: Foundations of Localized Symmetry Mathematics Date: April 18 2026 Noon - 14:00 EST Summary: The moment you use Euclid’s definitions of points and distances in any of your mathematical axioms, all that follows is assured to produce some level of nonsensical results when applied to the foundations of physics. The reason is not complicated: Euclid’s definitions are deeply mired in accepting as a “given” the very concepts that emerge only in well-defined inertial frames, which in turn are local instances of symmetries that are always finite and context dependent. In this talk, Terry will discuss how reframing mathematics in terms of symmetries that, as in the real world, are finite, composite, and dependent on self-observation (acceleration), results in a richer and far stranger set of mathematics in absolute conservation of quantum numbers generate local and global symmetries — the opposite of Noether’s theorem — that in turn create the emergent classical phenomenal such a particles, fields, space, and time. Speaker: Terry Bollinger is a computer scientist with BS, MS, and professional degrees from the Missouri University of Science and Technology.

Think you aren't flexible enough for yoga? Afraid to get onto the floor? Living with physical aches or restricted range of motion? Then this is the perfect yoga class for you! Explore your body's strengths in a fun, supportive environment while maintaining and growing your range of motion, flexibility, balance, strength, and sense of peace. All are welcome in this therapeutic class. Come ready to try new things, laugh, ask questions, and support each other. **Please reserve your spot at www.piesfitnessyoga.com.** The session is offered both InStudio and OnLine. The Zoom link for the OnLine session will be emailed 15 minutes before class starts to those who are registered at www.piesfitnessyoga.com. **Sign up for sessions must be made at least 2 hours prior to class.** The address is 1322 Prince St Alexandria, VA 22314. Our entrance is located on the side of the building, parallel to West St. **Street parking is available and additional parking is located at Shiloh Baptist church, spaces 3,5,7,9.** The church is located across the street from the studio, on the corner of Duke St. and West St. Discount is available to seniors, teachers, students, emergency responders, and military. All can save by purchasing class packs.

10:00 AM - Meet & Create UPDATE: We’ll start at the studio with networking and then go on a FIELD TRIP to Ace photo for their Customer Appreciation Day (https://maps.app.goo.gl/Y2jVscqSNsAhLL8E8?g_st=i&utm_campaign=ac-im) 12noon - Lunch + Networking After the field trip, we’ll head to a local restaurant for lunch and continued networking and conversation.

Title: Potential Applications of Negative Radiation Pressure in Astronomy, Medicine and 2WQC Date: April 19 2026 10:00 am - Noon EDT (16:00 - 18:00 CET) Abstract: While we are used to heating and pushing with light, there is also optical cooling and pulling. I will talk about negative radiation pressure, potential ways to generate it, and its novel applications, like non-ionizing medical scanners, 2WQC (two-way quantum computers) in theory solving NP problems, also potential astronomical sources and their observation. Speaker: Dr Jarek Duda is an assistant professor at Jagiellonian University. He holds degrees in computer science (PhD), mathematics (MSc) and physics (PhD). He is mainly focused on physics foundations, information theory, statistical analysis, and is known for introduction of asymmetric numeral systems.

We are going to talk about the books we read—any books, from any genre. Whether it’s fiction or nonfiction, classic literature or something modern, everyone is welcome to share their thoughts, impressions, and favorite passages. It’s a relaxed and friendly conversation where we can discover new ideas and enjoy each other’s perspectives.

Bring your work or your hobby, hang out, and code with us. Follow @buckeyecocoa for more information.

This month's prompt concerns the idea of the “warrior philosopher” (seemed appropriate in these times)--that is someone whose understanding of violence, power, and justice is forged through direct experience of war. We are looking at Major General Smedley D. Butler, a highly decorated U.S. Marine raised in a Quaker (pacifist) tradition who later became a prominent critic of American militarism (there is a wonderful biography of Gen. Butler called "Gangsters of Capitalism") Butler's argument in *War Is a Racket* (1935): that many U.S. interventions were driven less by national defense than by corporate and financial interests, with Butler portraying himself as an enforcer for business and Wall Street. We can consider the moral ambiguity of his insider critique—whether complicity strengthens or undermines credibility and also consider some of the concrete reforms he proposed (e.g., “conscript” capital before soldiers, restrict the military to coastal defense, and have only those who fight decide on war). Butler’s life arc clearly changed from pacifist upbringing to warrior to antiwar crusader—and asks whether true understanding of peace requires firsthand knowledge of war, and what that implies about the cost of suffering. So do we need to suffer to understand suffering? Do we have to experience war to appreciate peace? As one more question: in the movie "A Few Good Men" Jack Nicholson's character says that "you have the luxury of not knowing what I know" so do most of us go through life oblivious to real violence and suffering? See you at Drunken Philosophy!

AI is changing how art is made. But when does it stop being your work and start being the machine’s? This month we're going to be doing a panel with with digital image, music, and written word artists, talking about at what point, while using AI in the creation process, does the work become not the artist creation? We encourage audience participation during this event that will be moderated by Chris Slee. Whether you’re deep in the field or just getting curious, come connect with others building and exploring AI in Columbus. Sponsored by [Transform Labs](https://www.transformlabs.com/services) Sign up also accessible via [Transform Labs Luma](https://luma.com/55umjqta)

Private Group. Closed to the Public Knowing ourselves and understanding our abilities is the first step toward wielding our gifts with control and accuracy. In subsequent classes we will verify and hone our talents with activities and discussion. These are hands-on workshops and participation is expected. The goal of our series will be to develop expertise in areas of particular interest such as mediumship, channeling, divination, healing and, etc.. Our ultimate directions will be determined by class members as we evolve. I look forward to sharing and discovering with you. - Cynthia

We connect you with up to 30 Men or Women tennis partners close to your PLAYING REGION and skill level. This program is less competitive, no champions crowned, no league standings just dedicated tennis partners who want to meet up with you on the courts. Players will meet up to play a tennis match or just to hit around. Just go through the [Join Page](https://www.tenniscolumbus.com/partner-program) to enter this program. [https://www.tenniscolumbus.com/partner-program](https://www.tenniscolumbus.com/partner-program)

**Improving Office in Franklinton** Physical location: Improving Office 330 Rush Alley Suite #150 Columbus, OH 43215 Schedule: 6:00 p.m.: Socialize, eat, and drink. Improving will be providing pizza and beverages. 6:30 to 8:00 pm. Main meeting and presentation(s). Topic: This month Chris Pazsint will be talking about Agentic Coding. How does one use CLI Based Agents, and Agentic IDEs such as Cursor, Kiro, Antigravity? How to include agentic coding plugins for IDEs you already love such as Visual Studio Code. We meet on the last Monday of each Month. Presentations are given by members and friends of this group. If you would like to do a presentation (small or large) on a python topic, please contact Central OH Python at centralohpython@gmail.com

Want to be a speaker? submit your talk to our Call for Presenters!!! https://sessionize.com/cbus-hug-2026/