Animals are sometimes declared ‘extinct’ (no one is aware of any living examples) while they still exist (sometimes for decades).
Until 1967, noone was aware of the existence of gamma-ray bursts, the result of the biggest explosions in the universe. The bursts were only visible to specialized satellites.
Right now, people are suffering from diseases caused by unknown viruses.
Animals are sometimes declared ‘extinct’ (no one is aware of any living examples) while they still exist (sometimes for decades).
Until 1967, noone was aware of the existence of gamma-ray bursts, the result of the biggest explosions in the universe. The bursts were only visible to specialized satellites.
Right now, people are suffering from diseases caused by unknown viruses.