Can You Hear Sound in Space?
In space, no one can hear you scream, and that tagline is basically correct. But NASA has released the ‘sound’ of a black hole, so what is actually going on?
Why Is the Ocean Salty? The Science of Seawater
The rivers that feed the ocean run fresh, yet the sea is salty. Here is where all that salt comes from, how much there is, and why it keeps piling up.