A simple cylinder in a steady flow creates a beautiful wake pattern known as a von Karman vortex street. The image above shows several examples of this pattern. Flow is from bottom to top, and the Reynolds number is increasing from left to right. In the experiment, this increasing Reynolds number corresponds to increasing the flow velocity because the cylinder size, fluid, and temperature were all fixed. As the Reynolds number first increases, the cylinder begins to shed vortices. The vortices alternate the side of the cylinder from which they are shed as well as alternating in their sense of rotation (clockwise or counterclockwise). Further increasing the Reynolds number increases the complexity of the wake, with more and more vortices being shed. The vortex street is a beautiful example of how fluid behavior is similar across a range of scales from the laboratory to our planet’s atmosphere. (Image credit: Z. Trávníček et. al)
You want to see some pictures of cool ladies with guns? Look up the Spanish Revolution of 1936 (more specifically CNT: confederación nacional del trabajo). They were a socialist group fighting fascism and one of few groups that encouraged women to fight along side the men.
Shaving was an Ancient Macedonian pre-battle tradition so unless you’re one of my people and about to go do some conquering then guess what, you’re culturally appropriating every time you shave. Every few days I have to roast a leg of lamb coated in lard and bay leaves while saying a prayer to the Olympian gods while my Hypaspist shaves my beard off with a bronze blade and anoints my hair with oils and perfumes. Then we drink wine and throw a few hemp branches on the fire, whip ourselves up into a frenzy, then meet our enemy at their gates and if you shave any other way then you’re trivializing my culture and rituals.