Phospholipid molecules are amphipathic. And what that means is they have this natural ability, they have the propensity to form bilayer membranes, as we discussed in the previous lecture. And we can actually utilize their propensity to form these cell membranes, these bilayers, to actually create these specialized lipid vesicles we, we call liposomes. And liposomes can be very important because we can use liposomes to basically study the permeability of cell membranes. And we can use liposomes to basically deliver drugs and things like DNA molecules to the cells of patients. So what exactly does a liposome actually look like?