Photo by Vishnu Mohanan from Unsplash GAINESVILLE, Fla. — A five-dollar circuit board could hold the key to near-instantaneous breast cancer screenings. Scientists say a new handheld device is capable of testing for breast cancer in less than five seconds using just a small sample of saliva. This portable device is not only remarkably quick and user-friendly but also highly cost-effective. The $5 device, along with its test strips that cost just a few cents each, uses common components. These in...