February 27: International Polar Bear Day. 27 February is International Polar Bear Day. Around this time, mother polar bears and their cubs are snug in snow dens. Polar bears hunt seals from the sea ice, so protecting the melting Arctic ice is very important for them.
1799 π§ Artist and explorer Frederick Catherwood was born; his detailed drawings of Maya ruins hidden in the jungles of Mexico and Central America amazed the world.
1877 πΏ Zoologist Joseph Grinnell was born; he kept careful field notes on California's animals and explained the idea of an ecological niche, each species' place in nature.
1940 π¬ Martin Kamen and Sam Ruben discovered carbon-14, which scientists later used to work out the age of ancient bones, wood and mummies.