Humans and chimps share something like 98 percent of our DNA. But what does this really mean?
Manta rays didn't react with social behavior when they saw themselves in mirrors.
The jury is still out on whether or not chimps are self-aware. Actually, the same goes for young children.
Two psychologists at Iowa State University, Stacey Sentyrz and Brad Bushman, conducted a telling experiment using nothing other than cream cheese and bagels.