How do bacteria grow so fast?
What do they look like? Where do microbes come from? Microbes, such as bacteria or fungi, are living organisms too small to be seen without a microscope. Some bacteria make us healthy, but other kinds make us sick. Microbes grow and multiply so fact that they make “colonies” containing a million cells or more, which we can actually see. We will observe bacterial colonies in sealed plates, including kinds that help you digest your food, as well as harmless relatives of the kinds of bacteria that give children strep throat or food poisoning. We will use math to figure out how bacteria grow so fast. We will expose petri dishes of nutrient medium to different sources of microbes — fingers, air, soil, or drinking water — and see what grows. 5. Gravity and Friction: How Things Fall, Slide and Roll. By Laura VanWormer How does gravity make things fall and slide? How does friction affect how fast things slide? How do balls roll down a slope? We will test the effects of gravity and friction o
