ahlam1399
08-17-2016, 02:54 PM
These middle schoolers have been working after school for six months building their giant human-powered brain sculpture. Will their ideas hold up or come crashing down?
أكثر... (http://www.npr.org/sections/ed/2016/08/17/486091728/building-the-pedal-powered-brain-countdown-to-race-day?utm_medium=RSS&utm_campaign=news)
أكثر... (http://www.npr.org/sections/ed/2016/08/17/486091728/building-the-pedal-powered-brain-countdown-to-race-day?utm_medium=RSS&utm_campaign=news)