Hiroshima

The gun-type bomb was never tested — yet it was the one they trusted. What Hiroshima's design and aftermath reveal about nuclear war.

Three credible sources, three different numbers — and the gap isn't new explosions. It's what each one decided to count.

In 1961, the Soviets dropped the largest bomb ever built — a weapon with no military purpose, designed to be seen.

Edward Teller proposed a 10,000-megaton bomb in 1954. The physics allowed it — the delivery problem killed it.

In 1962, the US detonated a 1.4-megaton warhead 400 km above the Pacific. The sky turned green for 90 minutes.

150 tons of stuff sits on the Moon. Two objects on one square meter tell opposite stories: a $5.50 nylon flag and a silicon disc built for millennia.

Nearly four million Americans say they've been abducted. Not one has produced a lab-verifiable artifact. What's going on?

Connecticut well water, Roman glass, and the isotope that changed the world — the strange story of element 92.

Satellite imagery shows the scale. It doesn't show the eight meters of crushed concrete, the asbestos dust, or the ordnance beneath.