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Bananas are slightly radioactive

Bananas contain a tiny amount of naturally radioactive potassium-40 along with ordinary potassium.

Why it is true

Potassium is essential to living cells, and a small fraction of natural potassium is the radioactive isotope potassium-40. The dose from eating a banana is extremely small and not a health concern.

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Open U.S. Environmental Protection Agency

Saturn is less dense than water

Saturn's average density is lower than the density of liquid water.

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Rainbows are full circles

A rainbow forms as a complete circle around the point opposite the Sun, although the ground usually hides its lower portion.

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Lightning is hotter than the Sun's surface

Lightning can heat the air it passes through to 50,000 degrees Fahrenheit, five times hotter than the surface of the Sun.

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Bananas are slightly radioactive

Why it is true

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Saturn is less dense than water

Rainbows are full circles

Lightning is hotter than the Sun's surface

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