Evidence No 1
What the development biologist Lewis Wolpert says:
Yes, it's official, men are from Mars and women from Venus, and here's the science to prove it
Evidence No 2
(Alert: It gets less serious from here on, okay!)
Proof That Men Are From Mars, Women Are From Venus.
But please see snopes.com below on how this wonderfully funny yarn emerged:
Evidence No 3
And the last word goes to Einstein...