5 NEED-TO-KNOWS TODAY

1 to watch

The Chasers Road Trip: Trains, Brains and Automobiles, ITV/STV. 9pm: Anne, Shaun and Mark travel across Japan.

1 to know...

Karen Carpenter, who was in the Carpenters with brother Richard, died from heart failure on February 4, 1983.

1 to answer

Who founded the social networking site Facebook on February 4, 2004? Answer above right.

Birthdays

Natalie Imbruglia, singer, pictured, 46; Alice Cooper, rock singer, 73; Gavin DeGraw, musician, 44; Kimberly Wyatt, singer, 39.

1 to listen to The Cipher - BBC Sounds:

A mysterious puzzle appears online. A fiction podcast with Anya Chalotra and Chance Perdomo.