Misc: what area is most famous for u.s. nuclear weapons testing?

Questions

On average, there are 333 squares of ---------- on a roll.?

---------- Americans are injured by toilets every year.?

40,000 Americans are injured by ---------- every year.?

A flush toilet exists today that dates back to ---------- B.C.?

About a third of Americans ---------- while they are still sitting on the toilet.?