1 00:00:00,080 --> 00:00:04,150 might be able to capture dark matter 2 00:00:07,510 --> 00:00:05,110 um 3 00:00:10,150 --> 00:00:07,520 okay i love these multi-part questions 4 00:00:14,310 --> 00:00:12,549 i am not trying to make a case that the 5 00:00:17,750 --> 00:00:14,320 tunguska blast was an anti-matter 6 00:00:19,590 --> 00:00:17,760 explosion i simply wished to point to it 7 00:00:21,029 --> 00:00:19,600 as an example of the type of event we're 8 00:00:23,429 --> 00:00:21,039 looking at 9 00:00:25,750 --> 00:00:23,439 in terms of neutrino detection 10 00:00:27,910 --> 00:00:25,760 that is constrained by 11 00:00:31,349 --> 00:00:27,920 particle interaction cross sections 12 00:00:33,510 --> 00:00:31,359 which at the moment we have no idea how 13 00:00:36,069 --> 00:00:33,520 to manipulate and there may in fact be 14 00:00:39,030 --> 00:00:36,079 no way even in principle to manipulate 15 00:00:46,709 --> 00:00:39,830 i 16 00:00:49,670 --> 00:00:46,719 oh uh dark matter 17 00:00:51,830 --> 00:00:49,680 we don't know what dark matter is but 18 00:00:54,229 --> 00:00:51,840 whatever it is it presumably shares the 19 00:00:55,750 --> 00:00:54,239 properties of neutrinos in having very 20 00:00:57,590 --> 00:00:55,760 low interaction 21 00:01:00,310 --> 00:00:57,600 cross-sections 22 00:01:01,910 --> 00:01:00,320 therefore being able to 23 00:01:04,710 --> 00:01:01,920 tap it for energy looks like an 24 00:01:06,390 --> 00:01:04,720 exceedingly remote prospect at this time 25 00:01:08,230 --> 00:01:06,400 i always bend the rules a little bit 26 00:01:15,350 --> 00:01:08,240 when younger people want to participate 27 00:01:21,109 --> 00:01:18,149 uh i was wondering how you would capture 28 00:01:24,469 --> 00:01:21,119 those particles to reuse them 29 00:01:27,590 --> 00:01:24,479 to get energy to 30 00:01:30,390 --> 00:01:27,600 use the other particles for more energy 31 00:01:33,109 --> 00:01:30,400 does that make sense 32 00:01:35,350 --> 00:01:33,119 uh okay how how do we 33 00:01:39,830 --> 00:01:35,360 how do we actually do the capture and 34 00:01:42,870 --> 00:01:39,840 reprocessing that i refer to so glibly 35 00:01:45,429 --> 00:01:42,880 the the answer is that this is where i 36 00:01:48,230 --> 00:01:45,439 wave my hands uh with the phrase of 37 00:01:50,469 --> 00:01:48,240 sufficiently advanced technology we know 38 00:01:51,590 --> 00:01:50,479 that it's physically possible in 39 00:01:53,190 --> 00:01:51,600 principle 40 00:01:54,789 --> 00:01:53,200 we don't know how to actually build the