About National Academy of Engineering's Grand Engineering Challenges for the 21st Century results of 10,000
07:49
09:11
02:33
10:52
03:34
01:49
08:55
06:03
02:50
01:29
03:00
32:25
02:46
02:29
22:19
27:37
04:25
10:57
03:15
04:01
03:10
06:56
06:46
11:44
10:37
06:35
01:14
31:32
12:49
09:40
05:46
18:27
14:17
09:12
09:42
06:41
07:24
10:23
03:31
04:17
04:45
02:54
42:20
07:32
03:14
01:47