LOL! At least that cartoon is funny!
I still don't like using moles, because 1 mol of oxygen and 1 mol of helium are two different things. What does a mole really equal? Yeah, it's 6.02x10^23, but what does that mean? Right now, I'm trying to figure out how many atoms are in 1 g of uranium-235. Is it (6.02x10^23)/235 = 2.6x10^21? I think that's the answer, but not sure. Just, my question is how do you convert amu, mol, and grams around? Well, I have chemistry tomorrow, we're continuing moles.
As for my sig (even though no one asked about it...), it means that 50kg of uranium-235 is the supercritial mass required for total nuclear fission (alpha particle hits u-235 nucleis, breaks into 2 pieces and released 2-3 neutrons, who smash into more atoms causing a chain reaction) of all the atoms in 1 microsecond (0.0000001s), or in other words, the formula for an atomic bomb

.