The first X-ray image, made by Wilhelm Röntgen in 1895, showed his wife's hand, wedding ring and all.
Why it is true
Röntgen discovered an invisible type of radiation that passed through skin but was stopped by bones and metal. He called it 'X-rays' because it was unknown. On seeing the image, Anna Bertha reportedly said she had seen her own death. In 1901 Röntgen received the first Nobel Prize in Physics.
Source: Nobel Prize Outreach
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.
Related facts
Penicillin was discovered by accident in 1928, in a mould that grew on a forgotten laboratory dish.
There were about 2.5 billion T. rexes on Earth.
Helium was discovered in the Sun in 1868, almost 30 years before it was found on Earth.
Humans have genes from bacteria, fungi, and viruses.
