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."
Every $1 invested in clean water can yield $4–$12 in economic returns. Access to clean water is perhaps the single most powerful tool for sparking economic growth that humanity has ever known.