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.
Muscles can't always go as fast as we would like them to, but they still have to provide the energy. The bow, the catapult, and the flea's resilin store that muscle energy then release it much faster than the muscles could. Remember that everything that happens in this world happens because there has been a change of energy from one form to another.