Colossal explosions shake a remote corner of the Siberian tundra, leaving behind massive craters. In Alaska, a huge lake erupts with bubbles of inflammable gas. Scientists are discovering that these mystifying phenomena add up to a ticking time bomb, as long-frozen permafrost melts and releases vast amounts of methane, a potent greenhouse gas.
Discover how the concepts of zero and infinity revolutionized mathematics.
What exactly is crypto, and how does it work? This technology is more than just money.
Who created the Nazca lines and why? New clues to one of the greatest ancient enigmas.
