Deepest known spot on the planet at 10916 m. Situated just north of Papua New Guinea. Has been visited four times by humans - first visit in 1960 by the submarine Trieste. No known animals live here.
Philosophy united in man's confusion in the face of a meaningless world. Søren Kierkegaard known to be first existentialist; "life is not a problem to be solved, but a reality to be experienced."
Called "the father of modern philosophy," Descartes (1596-1650) was a polymath who made significant contributions in multiple fields. His most famous philosophical dictum is "I think, therefore I am."
When submerged in water, human skin shrivels up like an old prune. But why? Wrinkly fingers improve our grip on wet objects, channelling away water like the rain treads in car tyres.