It's a good idea in the current climate to keep *any* display of
knowledge of chemistry/physics to yourself.

I have no working knowledge of chemistry, but anyone with a library
card can get more access to "dangerous" information than they'd
ever need.

Perhaps if the government arrested anyone who walked into a public
library just on the off-chance they might be trying to make an
offensive weapon, rock cakes for example, the world would be a safer
place.

Next on the agenda: ban science and physics lessons in school, and
teach the kids nothing about the most common religion in their own
country in case it offends a minority somehow...