I went to visit a mosque in Shibuya 10 years ago. I went back last month.
V peaceful place. Muslims and non-Muslim visitors were seen gathered after Friday prayers for free lunch.
The only difference between then and now are openly loudmouth racists on social media.
Right before you fall asleep, your hands and feet get warmer. That warming is the real trigger that switches your brain into sleep mode. A 1999 Nature paper tested it against melatonin, core body temperature, heart rate, and how sleepy people felt. The hand and foot warming won.
The drawing in the tweet works on this exact trigger. The pose has a name in Japan: Mōkan Undō, or "capillary exercise." Katsuzō Nishi designed it in 1927. He was the chief technical engineer on the Tokyo subway, Japan's first. It became one of six daily exercises in his system, still done in Japan today.
You lie on your back, point your arms and legs straight up, and shake them for thirty seconds. While the limbs are up, gravity drains the blood from them. When you lower them, the blood floods back into your hands and feet, warming them in seconds. Your brain reads that warming as a green light to sleep.
The shaking activates a separate reflex, the kind most mammals use after a scare. Dogs and rabbits shake themselves off after a fright for the same reason. Dr. David Berceli, a trauma therapist, built a whole method around it, with certified instructors now in 40 countries. The shaking flips your nervous system out of "I'm wired" mode and into "I'm safe to sleep" mode.
Nishi got the biology wrong. He believed capillaries, the tiny blood vessels at the ends of your veins, did the pumping. William Harvey, an English doctor, had shown the heart did the work, three centuries earlier, in 1628. The exercise still works, for entirely different reasons than Nishi thought. The drained limbs come back warm. The body reads that as a sleep cue, and the shaking calms the nervous system on top of it.
A drawing on X with millions of views just rediscovered a 100-year-old Japanese sleep exercise. A subway engineer designed it first, decades before sleep scientists figured out why it would work.
Ask Claude to document and describe the main flows in your app and output in a single page html + json data file.
Incredibly useful for humans and the JSON file is very useful for explaining the flow to the LLM when working on new features/bugfixes.
한국에서 갑자기 화장실이 가고 싶어지면
네이버 지도에서 ”개방화장실“이라고 검색해보세요.‼️
포인트는 공용화장실이 아니라 개방화장실이라고 입력하는 거예요.그러면 근처에서 무료로 이용할 수 있는 개방 화장실이 나옵니다.
한국은 매장 내부에 화장실을 운영하는 큰 매장 또는 스타벅스/맥도날드를 제외하면, 상가 건물 안에 화장실이 있거나 열쇠나 비밀번호를 직원에게 물어봐야 하는 경우도 많아요… ㅜㅜ
특히 성수, 홍대, 명동, 이태원, 압구정처럼 많이 걸어 다니는 지역에서는 미리 개방화장실을 검색해두면 꽤 안심돼요.
여행 중에는 사소해 보이지만 정말 도움 되실거니 저장해뒀다가 여행 전에 꺼내보세요‼️
<—성수동/압구정 개방화장실
홍대 거리 개방화장실 —>
the fastest growing GitHub repos in finance this week:
1. TradingAgents (+7.9K ★)
multi-agent LLM trading framework from UCLA/MIT. fundamental analyst, sentiment analyst, technicals, risk manager with DeepSeek V4 thinking-mode support.
2. FinceptTerminal (+4.3K ★)
open-source Bloomberg alternative built in C++20 + Qt6. 37 AI agents in Buffett/Munger/Lynch/Graham style. real-time trading with 16 broker integrations. internal MCP + AI quant tabs.
3. daily_stock_analysis (+2.3K ★)
LLM stock analyzer for US, A-share and H-share markets. auto-builds a daily decision dashboard with entry/exit levels. pushes to WeChat/Telegram/Discord/Email via GitHub Actions.
4. Vibe-Trading (+1.9K ★)
personal trading agent. natural language - strategy - backtest - export to TradingView/MT5. your own AI trading desk in one pip install.
5. QuantDinger (+837 ★)
self-hosted AI quant OS. research markets, generate Python strategies, backtest ideas, run live trading. crypto, stocks via IBKR, forex via MT5. one Docker Compose, your infra, your data.
6. TradingAgents-CN (+641 ★)
Chinese fork of TradingAgents. fully localized for A-share markets, Chinese data sources, and domestic LLMs.
7. last30days-skill (+630 ★)
AI agent skill that researches any topic across Reddit, X, YouTube, HN, Polymarket and the web in the last 30 days. plug it into any agent.
8. qlib (+569 ★)
Microsoft's AI-oriented quant investment platform. end-to-end: data - alpha - portfolio - execution. the most serious open-source quant infrastructure out there.
9. scientific-agent-skills (+511 ★)
ready-to-use agent skills for research, science, engineering, analysis, and finance. plug into any agent framework. covers bioinformatics, cheminformatics, and now Hugging Science.
10. OpenBB (+387 ★)
open-source financial data platform for analysts, quants, and AI agents. stocks, crypto, options, derivatives, fixed income шт one platform. integrates with AI agents via MCP.
Karpathy didn't make a course.
He made THE course.
3 hours. Free.
Tokenization. Attention. Hallucinations. Tool use. RLHF. DeepSeek. AlphaGo.
Every behavior you've ever wondered about in an LLM - where it comes from, why it exists, how it was engineered.
The gap between engineers who understand this and engineers who don't isn't technical depth.
It's the ability to conceive of entirely different things.