Twenty or 20 may refer to: . 20 (number), the natural number following 19 and preceding 21 one of the years 20 BC, AD 20, 1920, 2020

Release and promotion. The album features many songs from the band's 20-year career. Most notable is the song "Every Rose Has Its Thorn", which was the band's biggest hit, a power ballad.A rare cover of the KISS classic "Rock and Roll All Nite" appears, previously only available on the soundtrack to the movie "Less Than Zero".The compilation also includes a new single, the …

The Cretaceous–Tertiary extinction event, now called the Cretaceous–Palaeogene extinction event, was about 65.5 million years ago. It may be called the K/T extinction event or K/Pg event for short. This is the famous event which killed most of the dinosaurs at the end of the Cretaceous period.. It was a large-scale mass extinction of animal and plant species.