About National Academy of Engineering's Grand Engineering Challenges for the 21st Century results of 10,000
10:54
10:26
05:03
04:55
06:21
02:08
05:26
51:26
02:27
12:46
01:57
12:39
15:33
02:13
13:13
03:56
11:34
03:54
09:35
03:15
07:39
09:43
07:38
02:52
11:38
12:14
09:35
03:10
11:20
05:26
03:02
08:11
15:07
10:30
08:03
03:20
05:46
06:11
02:09
07:26
04:48
03:49
02:44
16:57
07:43
14:16