You Are Not So Smart: Why You Have Too Many Friends on Facebook, Why Your Memory Is Mostly Fiction, and 46 Other Ways You're Deluding Yourself

by David McRaney

Maximilien Ringelmann, who discovered in 1913 that if he had people get together in groups to pull on a strain gauge, their combined efforts would tally up to be less than the sum of their individual strength measurements on the same instrument.