Optical filters are made for filtering out parts of the color spectrum that we don’t need, or that are even harmful. Migraines, for instance, are often caused by light from a particular part of the spectrum.  Hooman Banei has invented a way to manufacture high-quality optical filters at scale for a reasonable cost.  As a child growing up in Iran, Hooman worked in his father's concrete manufacturing company, but he wanted to be an astronomer.  “My father and I had a debate about what I should do my life,” and Hooman decided to go into science before returning to manufacturing.