About National Academy of Engineering's Grand Engineering Challenges for the 21st Century results of 10,000
05:47
05:46
07:16
05:43
09:29
03:56
12:45
06:03
217:18
03:03
13:44
14:13
11:29
03:13
06:19
00:33
02:03
59:03
10:37
04:54
10:46
05:08
11:44
36:20
02:20
07:31
03:23
08:22
06:26
02:47
12:44
23:35
07:02
25:35
00:40
02:39
10:07
09:25
06:18
06:18
15:00
05:47
06:07
03:39
01:52
05:24