I did this a while ago, but different dice have different densities so with the materials available to me I was only able to get a portion of them to float.

You should follow my example and, having discovered that some are balanced and some are not, put them all back in the same jar and ultimately learn nothing.

just roll each one an infinite number of times and see how the probability distribution works out

Now all you need is a kiddy pool, a ton of salt, and an indigo child to float in the pool; in an effort to perform random astral projection, locate and match people up to play D&D. Then dump a thousand d20s in the pool and have the child telekinetically randomize the rolls.

I'm certain there's a method to create randomization via shock therapy. We just need children to experiment on. Perhaps if we administer LSD to pregnant women in hospitals during ongoing double blind tests on a global scale, we can increase our chances of creating super human children for the strict purpose of more authentically randomized D&D.

I mean, it's not just the rolls that need to be given more randomization, the world creation and random events that are generated by human creativity aren't truly randomized --

But if we inundate developing fetuses with hallucinogens and then hook them up to machines and float them in saline solutions, we stand a chance at creating some truly frightening... err, creative D&D worlds.

This experiment brought to you by the number 4. =)