All you need to make your own snow are a book of safety matches, a silver coin, a drop of iodine and some cold air in an enclosed space. A black background and a flashlight help, however, by making the tiny flakes visible. The procedure is shown below. For cold air, try any of the following: (1) the inside of a home freezer or a frozen-food cabinet; (2) a big empty jar, chilled by packing dry ice around it in a bucket (but don’t touch the dry ice with bare hands!); (8) the inside of a closed car, or a similar space, on a cold winter night. Blowing into the ice-cube section of a refrigerator won’t work, because all the cold air spills out of it when the door is opened.

“How to make snow at home.”
Popular Science. June 1947.

Annie Leibovitz

a sensitive microphone

Levers Are Helpers
These children are lifting each other with their seesaw board. The board helps them lift. It is the kind of helper that is called a lever.
When you push down on one end of a lever, the other end lifts up. You can lift a much heavier load with a lever than you could lift without it.

Bernie Karlin