68% of the universe is dark energy, and 27% is dark matter; both are invisible, even with our powerful telescopes. This means we have only seen 5% of the universe from earth.

The Quietest place on Earth is an anechoic chamber that’s 99.99% sound-absorbent. You can hear your heart beating, your lungs, and your stomach gurgling loudly.

The beautiful symmetry of a total solar eclipse happens because —by pure chance— the sun is 400 times larger than the moon, but is also 400 times farther from Earth, making the two bodies appear the exact same size in the sky.