1 00:00:00,500 --> 00:00:01,968 [SQUEAKING] 2 00:00:01,968 --> 00:00:03,444 [RUSTLING] 3 00:00:03,444 --> 00:00:04,920 [CLICKING] 4 00:00:15,857 --> 00:00:17,690 JEFFREY GROSSMAN: Now, why does this matter? 5 00:00:17,690 --> 00:00:19,190 I've got two Why This Matters today. 6 00:00:19,190 --> 00:00:22,400 My first one is on a personal scale, smaller scale. 7 00:00:22,400 --> 00:00:25,780 And then my next one is on a grid scale. 8 00:00:25,780 --> 00:00:28,370 So this is called the little sun. 9 00:00:28,370 --> 00:00:31,700 There's over a billion people who can't read at night, 10 00:00:31,700 --> 00:00:34,340 because there's no access to electricity. 11 00:00:34,340 --> 00:00:37,070 And of course, a lot of the studying that you could do 12 00:00:37,070 --> 00:00:38,330 would be at night, right? 13 00:00:38,330 --> 00:00:40,220 So this is a really cool program. 14 00:00:40,220 --> 00:00:41,120 Why does this work? 15 00:00:41,120 --> 00:00:41,990 This is solar cell. 16 00:00:41,990 --> 00:00:43,657 But this wouldn't work, unless you could 17 00:00:43,657 --> 00:00:45,110 store the electricity, right? 18 00:00:45,110 --> 00:00:46,910 So I wanted to make you guys aware of the little sun. 19 00:00:46,910 --> 00:00:47,743 I'll pass it around. 20 00:00:47,743 --> 00:00:50,480 You just press this, and you can read at night, right? 21 00:00:50,480 --> 00:00:52,550 This is already making a big difference 22 00:00:52,550 --> 00:00:56,720 in millions of people's lives. 23 00:00:56,720 --> 00:00:58,280 That doesn't happen, unless you've 24 00:00:58,280 --> 00:01:01,850 got electrochemical energy storage, right? 25 00:01:01,850 --> 00:01:06,190 And there's some stats up here. 26 00:01:06,190 --> 00:01:08,360 25 billion liters of kerosene are 27 00:01:08,360 --> 00:01:12,260 used to meet the basic lighting needs in a lot of these places. 28 00:01:12,260 --> 00:01:17,180 That releases tremendous amounts of toxic fumes. 29 00:01:17,180 --> 00:01:21,960 And you can make a huge difference, but you can't-- 30 00:01:21,960 --> 00:01:23,510 the same as cooking, right? 31 00:01:23,510 --> 00:01:28,640 So wood fire cooking is a huge problem. 32 00:01:28,640 --> 00:01:30,860 So the challenge is-- but you don't cook. 33 00:01:30,860 --> 00:01:33,230 If you have a solar cooker, that's 34 00:01:33,230 --> 00:01:36,170 great, except that most people don't cook during the day. 35 00:01:36,170 --> 00:01:38,900 They cook at night or in the morning, right? 36 00:01:38,900 --> 00:01:41,810 And so you've got to store energy 37 00:01:41,810 --> 00:01:44,720 to make these things actually useful, right? 38 00:01:44,720 --> 00:01:46,430 And I really like this program. 39 00:01:46,430 --> 00:01:48,830 So I wanted to make that one of my Why This Matters. 40 00:01:48,830 --> 00:01:51,820 And we'll go big on the next one.