So what exactly allows these two structures to form spontaneously? So, as we said a moment ago, it's the hydrophobic effect that is the driving force in the formation of the cell membrane, the lipid bilayer and micelles. So the interaction of the hydrocarbon tails releases the water molecules from the nonpolar regions and this is energetically stabilizing, energetically favorable. So in this particular case, the water molecules were trapped around that hydrophobic region. But because we formed these structures and these structures, that leads to a maximum interaction between the water molecules and these polar heads, at the same time it locks in these or it hides these hydrophobic regions on the interior portion of the mind cell and the interior portion of the cell membrane, the bilayer membrane. And so we have these stabilizing lung dispersion forces that exist on the interior.