Researchers develop first room temperature holmium-doped yttrium lithium fluoride thin disk laser
In a study published in Optics Express, a research group led by Prof. Fu Yuxi from Xi'an Institute of Optics and Precision ...
6 SAD Lamps That Can Help With Seasonal Depression, According To Experts
These light therapy lamps can improve mental health, but there's a few things you should know when buying one.