Okay! Last question was a warm-up question. And now to get your brain thinking some more, how about another one?: First you eat me, then you get eaten. What am I?

Protons and neutrons are found within the nucleus of an atom

The speed of light can be used to measure the

Emagnitude of the electrical force acting between a +2.4 ×  10–8  c charge and a +1.8 ×  10–6  c charge that are separated by 0.008 m is    n, rounded to the tenths place.