All motorcycle waves are truly a gesture to communicate support and camaraderie, often dedicated to just true motorcycles, from crotch-rockets to custom-built ones, versus something like a moped ...

sound waves cause air particles to vibrate back and forth; ripples cause water particles to vibrate up and down. A longitudinal wave is one in which the vibrations of the particles are parallel to ...

Using demonstrations on the beach and his animated sketchbook Jon looks at the two main types of wave: transverse and longitudinal. Sea waves, light waves, and Mexican waves are all transverse waves.