Scientists often make measurements. The physical quantities they measure fall into two categories: scalars and vectors. Scalar and vector quantities are treated differently in calculations. Motion - ...

It is not only moving objects whose speed can vary. The speed of the wind and the speed of sound also vary. A typical value for the speed of sound in air is about 330 m/s.

If you buy something from a Verge link, Vox Media may earn a commission. See our ethics statement. Google Motion Stills took the untapped potential of Apple’s Live Photos and made them a killer ...