Circumhorizontal arcs (loosely known as fire rainbows) are the rarest of all naturally occurring atmospheric phenomena.
21
Dirty snow melts faster than clean.
350
Oak trees are struck by lightning more than any other tree.
266
Rain contains vitamin B12.
188
Moist air holds heat better than dry air.
114
Temperatures have been cooling since 2002, even as carbon dioxide has continued to rise.
106