Feynman explained that ice is slippery because, as we all know ice is less dense than water, and the application of pressure to the surface of ice causes the area of ice in contact with the surface applying pressure undergoes a phase change to liquid phase, and the liquid layer caused by the presssure is what makes that layer slippery.

that sounds right to me, but some modern scientists say that is bullshit and Feynman was wrong.

so what DOES make ice slippery?