Imagine picking up a ball of ice and having it rest firmly in the palm of your hand. In a world without friction, that could totally happen. Of course, nobody and nothing could survive in such a reality, but that’s neither here nor there. When it comes to the science of our universe, the role that friction plays is both paramount and perplexing for scientists and researchers. Ice is one of many examples of that. When frozen water is introduced to friction, a thin layer of water develops on its surface and acts as a lubricant, making an otherwise firm surface extremely slippery (via Reconnect with Nature).

According to Vox, that thin liquid layer is about 1,000 times smaller than a bacteria, making it difficult to examine. Once scientists were able to manufacture the technologically advanced microscopes they needed for an in-depth look, they realized that the thickness of this layer is a single atom for gas ice but multiple atoms for liquid ice (via Inside Science). What they can’t figure out is why these two very different types of ice have a seemingly identical reaction to friction. The debate is an ongoing slippery slope. 

So, to recap, ice isn’t slippery, science isn’t all-knowing, and friction isn’t just the force that causes wear and tear on your bicycle tires.