In order to win at the science fair, go to the experts: these blue-ribbon science experiments are based on those from real students, and they're smart, imaginative, fun to do, and sure to be a hit with the judges! Youngsters will find over 50 exciting and challenging choices in all the major categories. Using easily found materials, they'll test such things as whether people who play video games have a different reaction time than those who don't, or if sound travels better underwater than through air. Easier projects come first, more difficult ones after, and many include a section called "Take a Closer Look" with research suggestions and additional information.<br />
还没人写过短评呢