Capillary Action is my favorite Wikipedia article: https://en.wikipedia.org/wiki/Capillary_action https://en.wikipedia.org/wiki/Capillary_action Leonardo da Vi

Capillary Action is my favorite Wikipedia article: https://en.wikipedia.org/wiki/Capillary_action https://en.wikipedia.org/wiki/Capillary_action Leonardo da Vinci observed Capillary Action making him remark that the paint brush was a gift from the gods. He rightfully observed paint brush has an unnatural, given our understanding at the time, attraction for paint. If you place the brush in a cup of paint, and come back some time later, the brush will have _pulled_ the paint into itself noticeably above the surface of the paint in the cup. It wasn't until the early 1800s that we had the early versions of the Young-Laplace equation which attempted to quantitatively explain the phenomenon. Fast forward to 1900, Albert Einstein's first paper was still exploring Leonardo's paint brush: https://web.archive.org/web/20171025203011/http://gallica.bnf.fr/ark:/12148/bpt6k15314w/f595.image.langFR https://web.archive.org/web/20171025203011/http://gallica.bn... The wikipedia entry reminds me that this world is full of magic and wonder, everywhere you look. Something as simple as a paintbrush can reveal something peculiar that takes generations of study by the brightest of human minds to try and explain. Go outside and turn over a rock, any rock, and there is a lifetime of wonder and mystery under it. And, just because we can explain it now, doesn't mean Leonardo's paint brush isn't magic. It just means that the magic is real.