About National Academy of Engineering's Grand Engineering Challenges for the 21st Century results of 10,000
12:34
02:15
07:41
05:23
10:53
04:06
07:04
06:13
03:04
00:30
10:01
06:49
04:01
19:45
10:59
15:04
03:10
03:12
04:33
05:58
10:27
00:54
02:09
02:42
06:03
06:35
03:40
28:34
08:44
10:10
01:01
09:00
30:54
02:14
07:42
09:34
07:41
25:04
04:40
50:34
15:50
03:08
02:29
11:16
14:41
13:32