About National Academy of Engineering's Grand Engineering Challenges for the 21st Century results of 10,000
13:02
04:49
06:18
09:17
07:14
06:00
04:45
06:28
04:07
04:57
07:00
17:37
02:58
04:37
03:24
19:53
15:37
04:49
03:24
05:10
15:04
10:28
04:24
04:57
12:27
03:46
05:48
11:20
12:32
04:51
10:58
08:24
09:20
05:23
05:33
07:10
18:20
06:45
07:53
09:13
03:45
06:04
03:18
06:57
11:34
40:59