Charles Darwin's theories of evolution have revolutionized the way mankind understands its origin. Now, engineers suggest that the process of natural selection may have surprising implications for spacecraft as well. An ion engine designed to power future spacecraft has achieved its optimal design via software that simulates Darwinian evolution.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.