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A single drop of blood contains around 375,000 white blood cells, and blood constitutes for seven per cent of your total body weight.
Question from Gretchen Schneider
Question from Joan Rowland
How did mass hysteria and misinformation in 17th-century America become a cautionary horror story?
Competition closes at 00:00 GMT on 3rd June 2021
Fact or fiction?
The sky is filled with water – this experiment will show you why