Armed with only a flashlight and a pistol, they crawled into pitch-black tunnels—booby-trapped, enemy-packed, and airless. These were the tunnel rats of Vietnam. Watch UPS driver's emotional ...

Space & Spaceflight Tiny Black Holes Could Have Left Tunnels Inside Earth’s Rocks The research team says it’s time to “think outside the box” since nothing else is working.

A primordial black hole the size of Mt. Everest would live 1 billion times the present age of the universe, NASA said. (The universe is some 13.8 billion years old.) ...

As is so rarely the case in the Israeli-Palestinian conflict, this answer truly is black and white. Either there is an underground series of tunnels below the hospital. Or there is not.

BUFFALO, N.Y. — Imagine the formation of a black hole and you’ll probably envision a massive star running out of fuel and collapsing in on itself. Yet the chaotic conditions of the early universe may ...