You can listen to the video (audio up) or read the transcript below.
These two tiles look and feel exactly the same, but only one of them is treated for non-slip when wet.
We now spread water equally and apply a lot of pressure to our baby shoe to test the friction. It is when someone has transferred the majority of their body weight to a slippery surface that they actually slip and fall. Our treatment responds to weight. The more weight, the more friction.