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.
02/04/2014 01:51 pm ET | Updated Feb 04, 2014. It's commonly said that we humans use only about 10 percent of our brains, with some people attributing Einstein's brilliance to his ability to stretch that paltry figure to 15 percent.