For example, the brown crust on atoaste d marshmallow is the result of sugar changing to iffer-ent substances in a mixture called caramel. A change in matterthat produces one or more new substances is a chemicalchange, or chemical reaction. The burning of gasoline in acarâs engine is a chemical change.
How much brain power does the average person use? About only 10% Though an alluring idea, the 10 percent myth is so wrong it is almost laughable, says neurologist Barry Gordon at Johns Hopkins School of Medicine in Baltimorâ¦e.
The idea that we only use 10 percent of our brains is a myth. âThe crazy thing about this belief is that despite being totally false, it is so well-known,â says Sam Wang, Ph.D., a Princeton neuroscientist and author of Welcome to Your Brain.