[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:06.61,0:00:09.04,Default,,0000,0000,0000,,If you live on the east coast\Nof the United States,
Dialogue: 0,0:00:09.06,0:00:11.49,Default,,0000,0000,0000,,you've spent the last\N17 years of your life
Dialogue: 0,0:00:11.51,0:00:13.29,Default,,0000,0000,0000,,walking, eating and sleeping
Dialogue: 0,0:00:13.31,0:00:15.86,Default,,0000,0000,0000,,above a dormant army of insects.
Dialogue: 0,0:00:16.43,0:00:18.23,Default,,0000,0000,0000,,These are the cicadas.
Dialogue: 0,0:00:18.88,0:00:20.03,Default,,0000,0000,0000,,Every 17 years,
Dialogue: 0,0:00:20.06,0:00:23.20,Default,,0000,0000,0000,,billions of them emerge\Nfrom the ground to do three things:
Dialogue: 0,0:00:23.23,0:00:24.98,Default,,0000,0000,0000,,molt, mate and die.
Dialogue: 0,0:00:25.66,0:00:28.35,Default,,0000,0000,0000,,There are 15 different broods\Nof cicadas out there,
Dialogue: 0,0:00:28.38,0:00:30.58,Default,,0000,0000,0000,,grouped by when they'll emerge\Nfrom the ground.
Dialogue: 0,0:00:30.60,0:00:32.68,Default,,0000,0000,0000,,Some of these broods\Nare on a 13-year cycle,
Dialogue: 0,0:00:32.71,0:00:34.34,Default,,0000,0000,0000,,others are on a 17-year clock.
Dialogue: 0,0:00:34.65,0:00:37.71,Default,,0000,0000,0000,,Either way, the cicadas live underground\Nfor most of their lives,
Dialogue: 0,0:00:37.74,0:00:39.51,Default,,0000,0000,0000,,feeding on the juices of plant roots.
Dialogue: 0,0:00:39.53,0:00:40.73,Default,,0000,0000,0000,,When it's time to emerge,
Dialogue: 0,0:00:40.75,0:00:43.30,Default,,0000,0000,0000,,the adults begin to burrow\Ntheir way out of the ground
Dialogue: 0,0:00:43.32,0:00:44.47,Default,,0000,0000,0000,,and up to the surface,
Dialogue: 0,0:00:44.50,0:00:46.44,Default,,0000,0000,0000,,where they'll live for just a few weeks.
Dialogue: 0,0:00:46.46,0:00:47.76,Default,,0000,0000,0000,,During these weeks, though,
Dialogue: 0,0:00:47.78,0:00:49.91,Default,,0000,0000,0000,,everybody will know\Nthe cicadas have arrived.
Dialogue: 0,0:00:49.93,0:00:51.41,Default,,0000,0000,0000,,There will be billions of them.
Dialogue: 0,0:00:51.44,0:00:52.64,Default,,0000,0000,0000,,And they're loud.
Dialogue: 0,0:00:52.67,0:00:55.38,Default,,0000,0000,0000,,Male cicadas band together\Nto call for female mates,
Dialogue: 0,0:00:55.40,0:00:58.59,Default,,0000,0000,0000,,and their collective chorus\Ncan reach up to 100 decibels --
Dialogue: 0,0:00:58.62,0:00:59.85,Default,,0000,0000,0000,,as loud as a chain saw.
Dialogue: 0,0:01:00.29,0:01:03.31,Default,,0000,0000,0000,,In fact, if you happen to be using\Na chain saw or a lawn mower,
Dialogue: 0,0:01:03.33,0:01:04.88,Default,,0000,0000,0000,,male cicadas will flock to you,
Dialogue: 0,0:01:04.90,0:01:06.68,Default,,0000,0000,0000,,thinking that you're one of them.
Dialogue: 0,0:01:07.18,0:01:08.81,Default,,0000,0000,0000,,Now, like most things in nature,
Dialogue: 0,0:01:08.83,0:01:10.83,Default,,0000,0000,0000,,the cicadas don't arrive without a posse.
Dialogue: 0,0:01:10.86,0:01:13.85,Default,,0000,0000,0000,,There are all sort of awesome\Nand gross predators and parasites
Dialogue: 0,0:01:13.88,0:01:15.89,Default,,0000,0000,0000,,that come along with the buzzing bugs.
Dialogue: 0,0:01:15.92,0:01:18.15,Default,,0000,0000,0000,,Take the fungus Massospora for example.
Dialogue: 0,0:01:18.18,0:01:21.12,Default,,0000,0000,0000,,This little white fungus buries itself\Nin the cicada's abdomen
Dialogue: 0,0:01:21.14,0:01:22.36,Default,,0000,0000,0000,,and eats the bug alive,
Dialogue: 0,0:01:22.39,0:01:23.86,Default,,0000,0000,0000,,leaving behind its spores.
Dialogue: 0,0:01:24.27,0:01:25.67,Default,,0000,0000,0000,,When those spores rupture,
Dialogue: 0,0:01:25.70,0:01:27.80,Default,,0000,0000,0000,,they burst out of the still-alive cicada,
Dialogue: 0,0:01:27.83,0:01:30.22,Default,,0000,0000,0000,,turning the bug into a flying\Nsaltshaker of death,
Dialogue: 0,0:01:30.25,0:01:34.01,Default,,0000,0000,0000,,raining spores down upon\Nits unsuspecting cicada neighbors.
Dialogue: 0,0:01:34.03,0:01:35.67,Default,,0000,0000,0000,,But while we know pretty precisely
Dialogue: 0,0:01:35.69,0:01:37.93,Default,,0000,0000,0000,,when the cicadas will arrive\Nand fade away,
Dialogue: 0,0:01:37.96,0:01:40.72,Default,,0000,0000,0000,,we're still not totally certain of why.
Dialogue: 0,0:01:40.74,0:01:42.08,Default,,0000,0000,0000,,There are certain advantages
Dialogue: 0,0:01:42.10,0:01:44.72,Default,,0000,0000,0000,,to having your entire species\Nemerge at once, of course.
Dialogue: 0,0:01:44.75,0:01:47.19,Default,,0000,0000,0000,,The sheer number of cicadas\Ncoming out of the ground
Dialogue: 0,0:01:47.22,0:01:50.12,Default,,0000,0000,0000,,is so overwhelming to predators,\Nit is essentially guaranteed
Dialogue: 0,0:01:50.14,0:01:52.43,Default,,0000,0000,0000,,that a few bugs will survive\Nand reproduce.
Dialogue: 0,0:01:52.45,0:01:55.50,Default,,0000,0000,0000,,And since cicadas emerge\Nevery 13 or 17 years,
Dialogue: 0,0:01:55.52,0:01:57.95,Default,,0000,0000,0000,,longer than the lifespan\Nof many of their predators,
Dialogue: 0,0:01:57.98,0:02:01.28,Default,,0000,0000,0000,,the animals that eat them don't learn\Nto depend on their availability.
Dialogue: 0,0:02:01.30,0:02:02.65,Default,,0000,0000,0000,,But why 13 and 17 years,
Dialogue: 0,0:02:02.67,0:02:05.03,Default,,0000,0000,0000,,instead of 16 or 18 or 12?
Dialogue: 0,0:02:05.62,0:02:07.72,Default,,0000,0000,0000,,Well, that part no one really knows.
Dialogue: 0,0:02:07.74,0:02:10.08,Default,,0000,0000,0000,,It's possible the number\Njust happened by chance,
Dialogue: 0,0:02:10.10,0:02:12.50,Default,,0000,0000,0000,,or, perhaps, cicadas\Nreally love prime numbers.
Dialogue: 0,0:02:12.98,0:02:15.47,Default,,0000,0000,0000,,Eventually, the cicadas\Nwill mate and slowly die off,
Dialogue: 0,0:02:15.50,0:02:17.41,Default,,0000,0000,0000,,their call fading into the distance.
Dialogue: 0,0:02:17.44,0:02:19.56,Default,,0000,0000,0000,,The eggs they lay\Nwill begin the cycle again,
Dialogue: 0,0:02:19.59,0:02:22.87,Default,,0000,0000,0000,,their cicada babies burrowing\Ninto the earth, feeding on plant juice,
Dialogue: 0,0:02:22.90,0:02:25.06,Default,,0000,0000,0000,,and waiting for their turn\Nto darken the skies
Dialogue: 0,0:02:25.08,0:02:26.71,Default,,0000,0000,0000,,and fill the air with their songs.
Dialogue: 0,0:02:26.74,0:02:28.53,Default,,0000,0000,0000,,In 17 years, they'll be ready.
Dialogue: 0,0:02:28.94,0:02:30.09,Default,,0000,0000,0000,,Will you?