Greg James talks about Comic Relief...
Radio 1's Greg James was one of the famous faces who took part in Comic Relief's big challenge this year to travel 110km down Africa's Zambezi river.
He was joined by celebs Dara O'Briain, Melanie C, Jack Dee, Chelsee Healey, and Phillips Idowu, battling rapids, dangerous animals and sweltering temperatures in an attempt to raise £1m for the charity.
So here at Newsround we though we'd set him another test - explaining what Comic Relief is all about in 30 seconds.
Check out what he had to say!