Nelson Mandela celebrated this 90th birthday this past week.

The U2's Bono and The Edge sang a brilliant rendition of "Happy Birthday" to call for a public holiday for peace in honor of Mandela's birthday.

Check out Mandela's nonprofit 46664, named after his prison inmate number, which organizes concerts to raise funds for AIDS charities.

Today's Scrabble word is smeek, or to smoke.