Things that have absolutely blown your mind!

[bannination]

For me, recently: The idea you can predict something so random so accurately. Plus the way he casually does the integration.
Pi and Buffon's Matches


Further back: Free Will isn't quite as free as we think.
Neuroscience and Free Will

.... yeah could have put these in the science thread, but how about a personal thread of things that have just really grabbed you personally.

Oh, this too: The universe in scale. I think it's been posted before though.
http://htwins.net/scale2/

[Stinger]

Frost "flowers" on Arctic ice. Extremely salty and full of bacteria.

The size scale was outstanding. Thanks.