albo:
Medioevo, Italia, nau! (via Esse – Solo Satira su Shockdom! » Blog Archive » Ultimora 623 – Qui la bioetica non può entrare.)
Doppler effect — soundwaves emitted by a stationary source, a moving source, a source moving at the speed of sound (mach 1), and a supersonic source.
(via likeaphysicist)