About National Academy of Engineering's Grand Engineering Challenges for the 21st Century results of 10,000
02:04
05:37
01:01
17:00
16:38
11:02
09:05
08:42
10:10
14:06
05:40
03:38
07:00
08:45
08:48
03:23
02:23
04:02
09:00
33:35
04:15
98:12
08:30
01:54
13:05
01:10
06:02
11:05
23:01
03:56
01:26
07:42
01:36
07:10
02:32
05:05
01:53
02:35
02:15
04:35
01:35
04:47
25:04
02:22
04:40
02:15