Daydreaming in the Solar System

One day, will there be balloon festivals in Venusian atmosphere? Will daring adventurers go skydiving in Jupiter’s atmosphere? I review All-inclusive tours of Saturn’s rings? I review Daydreaming in the …

Why Quantum Matters

Quantum mechanics — 100 years old this summer — is the most successful theory in all of physics. And yet, physicists still argue about what it says about reality. Read …

An artist's rendering of Lucy's species (Australopithecus afarensis).

“Lucy” at 50

Donald Johanson reflects on his fossil discovery that shook the human family tree a half century ago. Lucy’s discovery has been making ripples in the world of paleoanthropology for half …