Add Yahoo as a preferred source to see more of our stories on Google. A high school student has been wreaking havoc among his teachers with a $16 gadget that can supposedly tell whether a diamond is ...

A simple finger test could help detect lung cancer, experts say. Dubbed the 'Schamroth window test' or 'diamond test,' the five-second trick lokos for clubbed fingernails, which is a telltale sign of ...