bbc.co.uk

nWpkb TIL that a zeptosecond is a trillionth of a billionth of a second. It is the smallest unit of time ever measured.
5VKe9 TIL the BBC’s Ceefax officially launched on 23 September 1974, making it the world’s first teletext service. It began as an experiment to provide subtitles for the hearing impaired but expanded to include news, weather, and sports.
worP6 TIL that in the 19th Century, Rudolf Lindt, of the famous Lindt chocolate family, accidentally invented the crucial step of "conching" chocolate – rolling the warm cocoa mass to make it smooth and reduce its acidity – by leaving a cocoa mass mixer running overnight.