coffee rings and catapults, courtesy of Holly.

In brief, i just received an email from Victoria's Secret with the subject "Be the sparkliest one at the party!". As i've mentioned to Holly, i do not feel as though i relate to a large percent of my gender. Giving it more that 3 seconds thought, i've now unsubscribed.

Moving on, this youtube clip regarding coffee rings was forwarded to me by Holly. i frequently notice it as i pay attention to my coffee mug tasseography, and do notice that the coffee from the single serving dispensers, for whatever reason, particularly displays this effect. i guess it might involve the manufacturing of the coffee serving cup things gives rise to round particles? i'll post a picture tomorrow. Note on coffee rings; there have been several Nature papers out regarding the general mechanism and altering it's effect (with nods to application in printing, biology, etc). It's a thing.

Which brings us to the differences between a trebuchet and other catapults, namely in that a trebuchet uses a raised counterweight to provide force. There's a surprising number of catapult designs, and wikipedia states that they all are strongly related a crossbow, mechanistically.

Update, my coffee mug: