Imagine waking up to find a massive lake that wasn’t there yesterday—only for it to vanish overnight! These 20 mysterious lakes around the world appear and disappear in ways that baffle scientists.

Don’t worry: It’s general enough to apply to the rest of Japan. But for busy people, here’s a summary of things you should know about what to do before, during and after an earthquake in Japan.

A shocking accident occurred in which a road suddenly collapsed, even though there had been no earthquake, and a truck ...