You can try this yourself at http://splasho.com/upgoer5/.
In my work I look at cups full of hundreds of hundreds of hundreds of hundreds of tiny little bits, such as little glass balls, or the hard white stuff that you can put on your food. When you try to move these bodies made up of little bits, such as when you move them from one cup to another, they act a little bit like water but not quite in the same way. We understand how water moves from one cup to another quite well, but it’s much harder when you have these little bits because they can do a lot of different things that water can’t do. It’s also harder to learn about how these little bits move because they are usually not see-through, so that you can’t look inside the body and see how it’s moving under the top.
I want to understand how these bodies made up of tiny little bits move when you make them go over things. It’s hard to try it out in real life because the bits are not see-through, so instead I use a computer where I can play with pretend tiny little bits. This lets me look at how each little bit moves. It’s also much cleaner to do it on the computer and I can try many different set-ups at the same time, but you have to make sure that the pretend little bits are like real ones.
It’s important to study how stuff made up of tiny little bits go over things, because sometimes too much of this stuff can move at the same time, very quickly, over houses. This happens quite often and a lot of people get hurt. It’s also interesting because people also use a lot of this stuff to build things and we need to know what’s the best way of moving it.