Pluto's moons

I live under a rock. The demoted planet Pluto has five moons and the last two just officially named: Kerberos and Styx. News item here. They used to be known as P4 and P5. Ok, from the baby astronomy books I've read... I thought it only has 1 or 2 moons. I must be reading some old book because P4 and P5 was discovered just in 2011 and 2012.

This dwarf planet is just less than 0.24% the mass of Earth (how do they measure that? see here. Kepler's Laws rules) and it attracted 5 moons. Impressive isn't it... So moons are fly-by rocks captured by gravity?

Earth would be much more interesting if we have more than 1 moon. See, ancient Chinese associate the sun with man and the moon with woman. Hard to do such analogy if we have 5 moons.

Pluto's orbital period is 238 years. The entire USA's history is just 237 years as of now. (2013-1776=237). When Pluto and its moons visit the same spot next time around... the USA and Earth would be different, very different, if it is still around.