Skip to Videos All | Adam Grant interview: What animal intelligence reveals about human stupidity with Justin Gregg | Re:Thinking Ryan Holiday: Justin Gregg on Animal Intelligence and Human Stupidity The Michael Shermer Show: What Animal Intelligence Reveals About Human Stupidity (Justin Gregg) Northshire Online: Justin Gregg - If Nietzsche Were a Narwhal with Barbara J. King The Dissenter: #667 Justin Gregg - If Nietzsche Were a Narwhal; Evolution, Animal Intelligence, and Human Stupidity VINEsanctuary: Human Error with Justin Gregg Books on Pod: Stupid Human Pricks ABC News: Professor Justin Gregg on why human intelligence isn't seen elsewhere