If you've ever sat waiting at the doctor's office to give a blood sample, you might have wished there was a way to find the same information without needles. But for all the medical breakthroughs of the 20th century, the best way to detect molecules has remained through liquids, such as blood. New research, however, could someday put a pause on pinpricks. A group of scientists announced they have created a small, portable device that can collect and detect airborne molecules -- a breakthrough that holds promise for many areas of medicine and public health.