When birds or insects fly, they displace air with their wings – that is how it works. Maybe sometime at night you have disturbed an owl and heard the flap of its large wings. This sound is a frequency ...

A human volunteer stands in a room furnished with a speaker. Sounds begin to play that are so unpleasant that the human steps back to move away. The sounds are eerie and conjure otherworldly beings, ...

Some species of spider can grab prey out of the air at night apparently without seeing it, and now we know how. An analysis of one such spider shows it uses its legs to pick up the sound of flying ...