Headaches always seem worse in the summer. But cooler heads can prevail with Ambi, an electronic icepack from Ambient Theraputics. Flip the switch on this handheld device and in 25 seconds, its stainless steel surface cools to 50 degrees Fahrenheit. When applied in certain places on the body, Ambi triggers a response from the hypothalamus, the part of the human brain that controls body temperature. According to the company, this type of cooling can reverse the heat and perspiration. It's also good for the minor injuries and insect bites that can occur at any summer outing.