0:11:50 > 0:11:57.
0:12:04 > 0:12:06Hi there, everyone, and welcome to Science Fiction.
0:12:06 > 0:12:09You ask the big questions, and we give the big answers.
0:12:09 > 0:12:11To the extreeeeeeeme!
0:12:11 > 0:12:14What? Sorry, are we not being extreme any more?
0:12:14 > 0:12:16BUD E, why don't you give us today's question?
0:12:16 > 0:12:19Today's question comes from Blinky in Helsinki.
0:12:19 > 0:12:20He asks...
0:12:22 > 0:12:26Clouds contain water vapour, which is H2O in gas form.
0:12:26 > 0:12:29If the cloud gets cold enough, this vapour turns to raindrops.
0:12:29 > 0:12:32Oh, rain, rain, rain, rain... I'm so sick of rain.
0:12:32 > 0:12:36When the temperature goes below zero degrees, this vapour turns into
0:12:36 > 0:12:39tiny pieces of ice, the beginnings of snowflakes.
0:12:39 > 0:12:42And they're all the exact same. You've seen one, you've seen 'em all.
0:12:42 > 0:12:45Same. Same. Same. Same. Same.
0:12:45 > 0:12:47- Not true, Professor.- Huh?
0:12:47 > 0:12:49Each one is an individual crystal
0:12:49 > 0:12:52arranged in a symmetrical pattern with six arms.
0:12:52 > 0:12:55As the snowflake falls to the ground,
0:12:55 > 0:12:58more and more water vapour freezes onto it, and the arms grow.
0:12:58 > 0:13:01Now, the shape of the arms depends on the atmospheric conditions -
0:13:01 > 0:13:03temperature, humidity...
0:13:03 > 0:13:06..seagulls, aeroplanes, UFOs...
0:13:06 > 0:13:07Professor, don't be ridiculous!
0:13:07 > 0:13:09Sorry, love. Sorry. OK, look,
0:13:09 > 0:13:10different conditions. Got it.
0:13:10 > 0:13:12So by the time they hit the ground,
0:13:12 > 0:13:14there's no chance of them being the same, is that it?
0:13:14 > 0:13:18Well, they could be the same in theory, but it's extremely unlikely.
0:13:18 > 0:13:21So there you go, Blinky, the chances of any two snowflakes
0:13:21 > 0:13:23being the same are extremely slim.
0:13:23 > 0:13:26Sure, that's just a load of old science fiction.
0:13:26 > 0:13:30# Science fiction! #
0:13:30 > 0:13:34Same. Same. Same. Same. Same. Same. Same. Same.
0:13:34 > 0:13:37Same. Same. Same. Same. Same. Same. Same.