He was still in two minds about whether this season would be his last as recently as six weeks ago.

BBC: Gough to retire at end of season

But the 35-year-old said he was in two minds about whether to join England coach Sir Clive Woodward's army of back-room staff.

BBC: Leonard mulls England role

The apples and the people and the houses are all similar insofar as they share in the form of two-ness, which exists independently of material things to exist in pairs or human minds to think about them.

FORBES: Does Math Really Exist?

The explosion of brain research in the last decade or so is revealing two extraordinary things about our huge, powerful, and largely unconscious minds.

FORBES: Get To Know Both Your Brains