A famous formula for π: π/4 = 1 − 1/3 + 1/5 − 1/7 + … This comes from a trigonometry formula: arctan(x) = x − x³/3 + x⁵/5 − x⁷/7 + … Putting x = 1 gives the series for π/4. This result was discovered independently by: Gottfried Wilhelm Leibniz (1673), James Gregory (1671), Nilakantha Somayaji (around 1500, in Tantrasangraha).

🚨 SlowMist TI Alert 🚨 The Shai-Hulud malware has resurfaced via the npm account atool(i@hust.cc), with over 600 malicious versions published. Notably, high-download packages such as size-sensor@1.1.4 (4.2M dl/mo), echarts-for-react@3.1.7 (3.8M dl/mo), and @antv/scale@0.6.2 (2.2M dl/mo) are at elevated risk. The attack carries risks: 1. AI agent hijacking: Claude Code, Codex, and VS Code tasks can trigger a Bun bootstrapper that re-executes the malicious payload. 2. Credential harvesting: The malware collects credentials from cloud services, GitHub, npm, local environments, and CI/CD pipelines. Using ^ to specify version ranges may cause npm to automatically install versions that have been compromised or contain security risks. Detection & Mitigation Measures: • Audit dependencies for any package published by atool (i@hust.cc) and check for suspicious preinstall scripts • Remove compromised packages and rotate all exposed credentials • Inspect CI/CD pipelines and local Node.js projects for malicious hooks or workflows • Revert to safe package versions or known-good dependencies ⚠️ Critical Action: Treat any system with affected packages as potentially compromised. Apply mitigation steps immediately.

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SpaceX is pushing banks for one of the lowest IPO fee rates ever. The company is negotiating to pay less than 0.75% on its planned $75B IPO, though banks could still collect roughly $500M in fees. Goldman and Morgan Stanley are reportedly set to take the largest share of the fee pool, with 21 other brokers involved. That is far below the typical IPO underwriting fee range of 4%-7%, and even low versus other mega-IPOs: GM 2010: $15.8B raise, 0.75% fee Facebook 2012: $16B raise, 1.1% Alibaba 2014: $25B raise, 1.2% Uber 2019: $8B raise, 1.3% Visa 2008: $17.9B raise, 2.8%