Researchers have found that under certain conditions, a laser beam can act like an opaque object and cast a shadow, opening new possibilities for technologies that could use a laser beam to control ...

Sunscreen is a vital skincare product that shields your skin from the harsh effects of ultraviolet (UV) radiation emitted by ...

Large light boxes mounted on walls or overhead stands are too distant to deliver 10,000 lux. • Fluorescent lamps should have ...