What makes lipids perfect for cell membranes? Well, remember that lipid molecules are amphipathic. And what that means is they contain a polar region and a nonpolar region. And it turns out that it's the amphipathic nature of lipids that gives them the propensity, the ability to actually form, form these cell membranes. So when we take a lipid molecule and we place it into an aqueous environment where water is a solvent, the polar water molecules will tend to form favorable interactions, hydrogen bonds with the polar region of that lipid. But the non polar hydrophobic section of that lipid will not want to interact with the water molecules.