explains_.everything on Instagram: "The Brachistochrone curve shows that the quickest route between two points isn’t a straight line but a cycloid—like the path traced by a rolling wheel. Gravity pulls the bead down the steep start, building speed that carries it faster than the straight path, even though the distance is longer. A 17th-century puzzle by Bernoulli, it remains one of the most elegant demonstrations that in nature, time often bends to deeper laws than distance."

96 reactions · 29 shares | Happy #AfricaDay! Today we celebrate the diversity and richness of Africa’s people, its art, food, culture, heritage, innovation, and so much more.朗 Ever wondered what the origin of the holiday is? Here's a history lesson in 60 seconds. | Global Citizen | Facebook