Some of those particles have a particularly useful set of properties: They don't naturally occur in the rocks, and they are radioactive. (sciencemag.org)
This was our third child and this high chair has two very useful settings that we had to purchase separately for our older children. (albeebaby.com)
The most useful setting in there is probably the path, but you can create other environment variables and use them in batch scripts if you need to. (howtogeek.com)