Bananas are radioactive
They are rich in potassium, and a small fraction of potassium is the radioactive isotope potassium-40. The dose is tiny — you would need millions of bananas for any harm.
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See all →Water can boil and freeze at the same time
At a precise pressure and temperature called the triple point (0.01 °C at 611.7 pascals), ice, liquid water and water vapour all exist together.
Read the fact →Honey never spoils
Archaeologists have found pots of honey in ancient Egyptian tombs that are still edible. Its low water content and acidity stop bacteria from growing.
Read the fact →Lightning is about five times hotter than the Sun’s surface
A bolt can heat the air around it to roughly 30,000 °C. The Sun’s surface is a comparatively mild 5,500 °C.
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