Computer mouse inventor dies aged 88

The inventor of the computer mouse, Doug Engelbart, has died aged 88. Engelbart developed the tool in the 1960s as a wooden shell covering two metal wheels, patenting it long before the mouse's widespread use. He also worked on early incarnations of email, word processing and video teleconferences at a California research institute. Doug Engelbart was born in Poland on 30 January 1925. The state's Computer History Museum was notified of his death by his daughter. In an email, she said her father had been in poor health and died peacefully on Tuesday night in his sleep. At least one billion computer mouses have now been sold. He is survived by his second wife, Karen O'Leary Engelbart and four children.