Headline Clickable. Whether raw or cooked, food can be chock-full of dangerous bacteria long before you can smell it. Perishable food (like chicken and other meats) should be tossed if left out at room temperature more than two hours (much less if in a warm room).
Catapult physics is basically the use of stored energy to hurl a projectile (the payload), without the use of an explosive. The three primary energy storage mechanisms are tension, torsion, and gravity.
We typically think of a catapult as something that was used in the Middle Ages to destroy the walls of castles. But Catapults have a very long history dating long before the time of castles and they were developed and designed in many different ways by many different cultures over the centuries.