The most famous packing problem concerns spheres. In 1611, the astronomer Johannes Kepler proposed that the densest way to ...

Explore Gemini 2.5, Google’s groundbreaking AI update with multimodal learning, 1-million-token context, and real-world ...

Current political and economic issues succinctly explained. Sign up to receive CFR President Mike Froman’s analysis on the most important foreign policy story of the week, delivered to your ...