About National Academy of Engineering's Grand Engineering Challenges for the 21st Century results of 10,000
43:02
02:40
10:30
06:23
11:13
09:03
32:18
06:15
03:59
01:48
10:44
20:00
06:26
01:46
13:05
00:43
04:31
01:28
05:36
13:01
08:25
06:21
01:36
05:54
01:39
02:14
16:07
11:01
14:07
10:31
49:01
24:31
06:05
02:55
04:40
02:40
31:31
03:08
15:06
13:09
05:32
05:19
01:49
18:11
00:59
13:38