why can't some birds fly

Posted by 212158***, views: 10647,
    www.youtube.com , level=15, 4:13 , on 2019/05/11

the physics of surfing

Posted by 212158***, views: 10145,
    www.youtube.com , level=15, 4:25 , on 2019/05/11

Nature boy (Paris Martín, UNIR)

Posted by 402185***, views: 14817,
    www.youtube.com , level=2, 2:08 , on 2019/05/11

history through the eyes of a chicken

Posted by 212158***, views: 10306,
    www.youtube.com , level=15, 4:50 , on 2019/05/11

future plans

Posted by cansua***, views: 9246,
    www.listen-and-write.com , level=11, 0:19 , on 2019/05/10

what makes a hero?

Posted by 212158***, views: 11225,
    www.youtube.com , level=13, 4:22 , on 2019/05/10

how playing an instrument benefits your brain

Posted by 212158***, views: 10473,
    www.youtube.com , level=18, 4:28 , on 2019/05/10

bad guy

Posted by kialic***, views: 1583,
    www.youtube.com , on 2019/05/10

how sugar affects the brain

Posted by 212158***, views: 11043,
    www.youtube.com , level=17, 4:48 , on 2019/05/10

what would happen if you didn't sleep

Posted by 212158***, views: 10799,
    www.youtube.com , level=14, 4:18 , on 2019/05/10