Our popular image of Homo erectus as the proto-guy who whose human-like traits all emerged at once needs overhauling, some anthropologists say. Sylvain Entressangle/Science Source hide caption

itoggle caption Sylvain Entressangle/Science Source

Blaine Badick walks through floodwaters with her dogs in Hoboken, N.J., on Wednesday. Brendan Smialowski/AFP/Getty Images hide caption

itoggle caption Brendan Smialowski/AFP/Getty Images

A piece of red ochre with a deliberately engraved design is pictured here at Cape Town's Iziko/South African Museum in 2002. The piece was discovered in Blombos Cave near Stilbaai, about 300 kilometers from Cape Town. Anna Ziemenski/AFP/Getty Images hide caption

itoggle caption Anna Ziemenski/AFP/Getty Images