Portal:Indigenous peoples of the Americas/Did you know/3

• ... that the Cascajal Block, a serpentinite slab from the Olmec civilization, was dated to the which early first millennium BCE and may represent the earliest writing system in the Americas?
• ... that Jim Thorpe (Sac and Fox) won the 1912 Olympic gold medals for the pentathlon and decathlon?
• ...that underwater panthers were creatures appearing in the mythology of a number of Native American traditions, which combined the features of mountain lions or lynx with those of snakes, and were believed to inhabit the deepest parts of lakes and rivers?