8+ hour, 19+ min ago   (823+ words) Chemists have long understood how reactions begin and end, but the most decisive moments when bonds stretch and finally break have remained hidden from direct view. These steps unfold at extreme speeds, driven by electrons governed by quantum-mechanical rules. Now,…...

1+ week, 6+ hour ago   (1060+ words) For decades, science textbooks and popular astronomy alike have repeated a simple idea: planets and people are made of stardust forged in ancient stellar explosions. While this remains broadly true, new meteorite evidence suggests the delivery mechanism of that material…...