Sound needs a medium (solid, liquid, or gas) to travel. Space is a vacuum, lacking the matter to carry sound waves. No sound in space means no echoes. While a near-perfect vacuum, some sounds can be ...

We tend to think of sleep as the time when our brains shut down for good, but in fact, what's around us, particularly sound, has great influence on how well we sleep. From the gentle patter of rain to ...

In space, no one can hear you scream. You may have heard this saying. It’s the tagline from the famous 1979 science fiction movie “Alien.” It’s a scary thought, but is it true? The simple answer is ...

Using a melodic song you enjoy as an alarm sound can potentially reduce feelings of grogginess upon waking. However, waking suddenly from sleep may have negative effects. Many people use an alarm ...