About National Academy of Engineering's Grand Engineering Challenges for the 21st Century results of 10,000
45:21
02:42
06:03
05:32
11:44
05:37
01:56
16:13
10:27
00:42
24:45
08:53
06:34
09:32
08:18
03:58
00:50
12:59
04:00
02:59
03:27
02:00
02:15
11:04
09:11
24:46
02:52
01:30
05:05
03:01
08:13
11:34
25:31
02:37
07:33
04:22
05:03
11:30
38:55
08:19
09:59
30:43
18:15
11:52
10:01
02:18