Scientists at the University of California, Berkeley developed a new material that could potentially be used to cool buildings. The material is a "molecular mesh" made of tiny molecules that are linked together in a regular pattern. When the mesh is exposed to heat, the molecules vibrate and absorb the heat, causing the mesh to cool down.

The researchers say that the molecular mesh could be used to create a new type of air conditioning system that would be more energy-efficient than traditional systems. The mesh could also be used to create clothing that would keep people cool in hot weather.

The research team is currently working on developing a prototype of an air conditioning system that uses the molecular mesh. They hope to have a commercial product available within the next few years.

Here is a more detailed explanation of how the molecular mesh works:

* The molecular mesh is made of tiny molecules that are linked together in a regular pattern.

* When the mesh is exposed to heat, the molecules vibrate and absorb the heat.

* The vibration of the molecules causes the mesh to expand.

* The expansion of the mesh creates a flow of air, which cools the surrounding area.

The researchers say that the molecular mesh could be used to create a new type of air conditioning system that would be more energy-efficient than traditional systems. The mesh could also be used to create clothing that would keep people cool in hot weather.

The research team is currently working on developing a prototype of an air conditioning system that uses the molecular mesh. They hope to have a commercial product available within the next few years.