So it basically bounces back and forth, and eventually it makes its way out, eventually collides with this phospholipid bilayer membrane, and it makes its way into this nonpolar region. So to enter that bilayer membrane, that non polar molecule must lose that salvation shell, the cage of water molecules around it. And once that happens, it enters that hydrophobic region of the core of that phospholipid bilayer membrane. And so now what begins to happen is we have these Van Der Valley interactions. So London dispersion forces, which basically exist between the non polar molecule and the tails, the hydrocarbon tails of these phospholipids. So eventually, it moves across and makes its way back out on the other side.