FUN Science Idea~ To help young physicists understand that for every action, there is an equal and opposite reaction you'll need these items: flexible straw, ruler, straight pin, marker, round balloon, masking tape, and pencil with eraser. Great way to teach air pressure and thrust!
The atomic theory of matter tells us that a gas is made up of tiny particles called atoms (or molecules, which are combinations of atoms), which are constantly in motion, smashing into each other and the walls of whatever container they might be in. Here is a highly visual model of this idea.
Traditional techniques for caramelizing onions can take hours to deliver extra-sweet, complex flavor. The pressure cooker reduces that time down to about 30 minutes of hands-off cooking. Finishing off those onions with sherry, stock, and some aromatics transforms them into a soul-satisfying classic French onion soup.