Scientific proof that men and women are different

And on Drudge I see we now have scientific proof that men and women are different. -WalrusRex

Did they test people in long-term relationships? Because, after 40-some years together the Mrs seems more alien to me than ever! (And I to her, surely.)

"Men and women are, for all intents and purposes, separate species existing side-by-side." (memquoting some old book)

That said, here's a funny pic c/o Pistol Pete, the Vic on PoliNation blog (every good blog needs one).
http://polination.files.wordpress.com/2013/12/gender-selection.jpg