it only means the first one when you’re telling someone what to do, if you’re in a position of authority, like their parent.

It’s likely, however, that it means “You can put lots of water in a nuclear reactor and it’s never too much.”

If you wanted to warn about the overuse of water, you would probably use shouldn’t or mustn’t.

One uranium pellet the size of a peanut can power more than 10’s of thousands of tons of coal, and if the waste is disposed of correctly is the cleanest and most efficient form of energy, dispite what you hear from all the environmentalists

There are turbines and generators involved too….