Band bending is an effective way to kill viruses because the technique allows electrons, which were freed by the UV, to travel forward and create hydroxyl radicals by reacting with water.

Timber swells when it is damp and shrinks when it is dry because it contains groups of atoms called hydroxyl groups, which absorb and release water.

What is the mechanism for the adsorption of water, hydroxyl and other minerals recently found on the Moon's surface?