Комплекс уроков “Электричество“
[club51080272|Проект “Научная Критика“]
[club51080272|Вся правда о сверхъединичных устройствах
MACHINES: HOW THEY WORK
Thursdays 10/9c on Science
Ten steel balls roll between the inner and outer rings within a yoyo’s shell. They work together...