Don't swim in this blue lagoon in a limestone quarry (the water of which has a pH of 11).
The mass of a supermassive black hole measured in suns (gif).
If you get hacked or your identity stolen, there is a way to change your Social Security number.
The geomythology of Great Flood legends - this article focusing on Tibetan history
The oldest human footprints in North America.
It is now believed that there was water flowing on Mars at a time when proto-humans first appeared on Earth.
The biology of the ACHOO Syndrome (sunlight-induced sneezing).
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