The center of mass of a uniform solid hemisphere of radius r is at 3/8r from the center. Therefore it tends to always stay upright. It's the principle used in Thanjavur dancing dolls. pic.twitter.com/iu63nUIuio — Massimo (@Rainmaker1973) July 18, 2026 Humanoid Robots in 2026: What Is Actually Deployed Technology.org Archaeologists Identify the First Classic Maya Astronomer Credited by Name ZME Sci...