As I understand it, a mobile phone and a base station communicate by exchanging photons. The antenna is like one half of a capacitor. Pulsating voltage is applied to the conductive antenna and that makes it loose energy by emitting photons. Similar pulsating voltages also get applied to capacitor...

This week I showed my high school students that if you add the mass of a proton and the mass of an electron the result is higher than the mass of a hydrogen atom, because of the binding energy being negative. I used very precise measurements of the masses, and some student asked how these measure...