The Book of Experiments (1958) [pdf]
This is just priceless. I admire the breezy dismissal of potential harm/injury, and the confident reliance on exercising "reasonable care". Favourite (so far, that is):26. A flour bomb as a noisy finale to our air experiments...  If you tried to set fire to a small heap of flour you would not succeed. But finely divided flour in a cloud—that can make a completely harmless bomb!... With a great BANG! off flies the lid of the tin. The finely divided flour has exploded.It is best to do this experiment out of doors. Not that the explosion is dangerous, but the lid might go through a window or do some damage in the room. It is also important to take care that the lid does not hit you in the face. Given reasonable care this flour bomb explosion is perfectly harmless.