Dear Tom and Ray: This morning I went to my car to find that it had grown what appeared to be "hair" from the tailpipe. It was about 10 inches long and gray, with brown highlights. I had to get to ...

A low-cost, durable sensor made from adhesive paper and dye-coated silica microparticles can identify and quantify a range of toxic gases, including highly dangerous compounds such as chlorosarin.