And that's exactly what allows us to form those liposomes, these vesicles that consist of this bilayer lipid membrane in which we have this internal aqueous compartment that is separated from the external Aqueous compartment. So, once again, lipid vesicles can be formed by mixing a lipid solution into an aqueous solution and then sonicating the solution. And sonication involves bombarding the solution with sound waves. The energy carried within the sound waves is used to basically increase the energy of these phospholipids, and that increases the kinetic energy, and so it disperses all these phospholipids. And that's exactly what allows these phospholipids to actually collectively aggregate and form the bilayer membrane and form these liposomes of interest. Now, we can also actually place specific types of molecules, molecules of interest, into the internal acreage compartment of our liposome.