7:25 play_arrow The Elegant Universe - Einstein's Relativity2 tuft471 visibility 1 schedule 17 سال پیش favorite
1:20 play_arrow Ice Bomb - Free Science Videos and Lectures tuft471 visibility 1 schedule 18 سال پیش favorite
7:15 play_arrow Carl Sagan 4th Dimension Explanation tuft471 visibility 7 schedule 18 سال پیش favorite
3:54 play_arrow Neutron Star Fromation, Black Hole Formation tuft471 visibility 6 schedule 18 سال پیش favorite