Hydrophobic sand, a.k.a., Magic Sand, a great way of introducing just what it means to be water hating

The above, brief video illustrates and discusses phospholipids as well as the molecule, cholesterol.

This video provides an illustration of just what it means for something to diffuse across a lipid bilayer. It is a lot more complicated than you might imagine (and/or, it's basically how diffusion works).

The above video provides a good introduction including to lipid bilayers and transport proteins.

The above video provides a short visualization of osmosis though doesn\'t stress the importance of how collision with the membrane is limiting to movement across it

The above video illustrates movement across lipid bilayers that doesn\'t involve an output of energy.