28 January

On 28 January 425,000,000 BC, the Silurians and Sea Devils signed a peace deal. (PROSE: Time Traveller's Diary)

In 1828, the Sixth Doctor and Evelyn Smythe witnessed the execution of William Burke in Edinburgh. (AUDIO: Medicinal Purposes)

In 1986, the space shuttle Challenger blew up seventy-three seconds after take-off, killing all seven of its crew. (PROSE: Return of the Living Dad, Father Time)