Sound

About this site

Bartosz Ciechanowski walks from vibrating air molecules to waves, pitch, loudness and interference, with interactive simulations along the way. You will hear the world differently afterwards.

When to open it

Set aside a while: this one easily runs past 15 minutes. It works on phones as well as computers, and it has sound, so headphones help if you're not alone. Best for learning and science.

Also in

• On your phone
• Bored at school
• Headphones on
• A long afternoon