Asked by: Erin Beach, Highlands
During the day, water evaporates from rivers and lakes, and plants pull it up through their roots and release it from their leaves. In the evening, the air cools and can’t hold as much water vapour. The excess condenses into water droplets, which collects on any cold surfaces near the ground, where there is less wind.
Luis trained as a zoologist, but now works as a science and technology educator. In his spare time he builds 3D-printed robots, in the hope that he will be spared when the revolution inevitably comes.