What happens after death?

[Streetboat]

I am certain I am at least 50% wrong, but quantum theory suggests that in some cases it is more useful to think of particles as waves because in order to ascertain their position you must waive the ability to ascertain their momentum (Uncertainty principle). The result is that for particles where you must know the momentum, like electrons, thinking of them as waves means you can know their momentum and somewhat accurately predict their position, because waves are regular. But there is no such thing as a a single particle being a wave, is there? I thought that waves were a collection of particles, uniformly spread.

Is that right? As I said, I am not confident of my knowledge of particles.

You have a mistake. There is something called Uncertainty principle (as you very well said) which says that you can't know both the momentum and the position of a particle/wave (I think it generally applies to any object). If you know the momentum then you can't know the position and vice versa. You can only work with probabilities.

A particle can't be a wave. It's two different things, but intrestingly an electron, just as light behave both as particles and as waves. For example:
electron (particle)- electromagnetic wave (wave)
photon (particle)- light wave (wave)

A wave is not necessarily a collectrion of particles.

It's called a superposition, and it was the first completely observable (i.e. not just a postulation) phenomenon that denies empiricism's control of the physical world. Einstein invented the double slit experiment as a thought experiment that was intended to be somewhat of a joke. He thought the idea of quantum physics was absolutely ridiculous, and boom, it happened 100% of the time.

By the way, the argument

Spoiler below!

"IF Betty is a cow
AND
IF All cows are Ungulates
THEN Betty is an Ungulate"

is a formal fallacy. Betty being an ungulate simply because she is a cow and all cows are ungulates is an undistributed middle; Betty is merely a cow. You don't call all bovines ungulates, you call them bovines, which is a characterization of bovine nature. It's like saying "all monkeys stand upright; all humans also stand upright; therefore, all monkeys are humans". Just because monkeys and humans have a similar genus doesn't mean they should be lumped into the same classification.

My own personal opinion on life and death, however, do not currently exist. I haven't experienced enough life to know what death means. All I know right now is that I would make people who love me very, very sad, so I would prefer to remain alive.