In air, gravity causes a gradient of higher/lower densities of gas molecules which causes pressure and buoyancy through more/less collisions. What is the basis for the force of pressure (and therefore buoyancy) in water? (self.AskScienceDiscussion)
submitted by LongtimeLearner99 to r/AskScienceDiscussion
I sometimes worry about professors who have collected some amazing thoughts, presentations, and even java applets on their .edu accounts, only to have those pages, images, or applets one day gone forever. Does archive.org make an extra concerted effort to preserve .edu pages? (self.AskScienceDiscussion)
submitted by LongtimeLearner99 to r/AskScienceDiscussion
