EasyScience
"I teach your body to fight an enemy it has never met. I am made from the thing that could harm you. I have saved more lives than any other medical intervention in history. What am I?"
Answer
A Vaccine
Explanation
Vaccines introduce a weakened or inactivated form of a pathogen to train the immune system. The body learns to recognise and fight the real pathogen if encountered later. Vaccines have eliminated smallpox and nearly eradicated polio.
This is an easy riddle in the Science category — Riddles about physics, space, biology and the laws of the universe.
Tags:sciencemedicinehistory
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