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Science & Nature
71 most-searched questions — answered clearly, no padding.
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How does WiFi work?
WiFi transmits data using radio waves at 2.4 GHz or 5 GHz frequencies between your router and devices, converting internet data into wireless signals and back.
↑ 650K/mo
Why is the sky blue?
The sky is blue because of Rayleigh scattering — the atmosphere scatters short blue wavelengths of sunlight in all directions more than other colors.
↑ 900K/mo
How far is the moon from Earth?
The Moon is on average 238,855 miles (384,400 km) from Earth, but the distance varies from about 225,000 to 252,000 miles due to its elliptical orbit.
↑ 700K/mo
What causes thunder and lightning?
Lightning is a massive electrical discharge between charged regions of storm clouds, and thunder is the sonic shockwave caused by the rapid superheating of air along the lightning bolt.
↑ 600K/mo