If you’re a fan of action movies or dance music, you’ll probably be familiar with sub-bass. The moment in those James Bond explosions that thuds through your chest in the movie theatre?

While a well-known use of this is sonar, ultrasonic sensors can also be put to use to make a radar-like system. This ultrasonic radar project is from [mircemk] who uses a small ultrasonic distance ...

Bats, whales, rhinos, dogs, pigeons, cuttlefish… all sorts of animals use infrasonic and ultrasonic frequencies to communicate, and humans can hear none of it. So the next time you're enjoying a ...