My dad and I woke up on December 17th, 2008 to this amazing rainbow outside our window. It was about 2 degrees Celsius outside, which is probably why a rainbow could form (rainbows can't form when there are ice crystals in the air, they need little round water droplets according to my dad a.k.a. Mr Science, see http://users.hubwest.com/hubert/mrscience/science16.html#rainbow on how rainbows form)
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