Ridha Azaiz was just 13 when he came up with an idea that he has not been able to get out of his head ever since. After reading that solar modules lose much of their efficiency when they get dirty, he tested and proved this theory on his balcony. He then set to work finding a solution to the problem: a cleaning robot. Now, at the age of 29, he has built his first functioning prototype, which moves over the slanted solar panels and cleans them with a brush, making them efficient again. Another output of his tinkering is Solarbrush, a company that Azaiz hopes will soon be selling its first robots to markets with sunny, but dusty desert climates.