Research has shown that lowering brain temperature may have good results in heart attack patients. Lowering brain temperature may be a promising treatment for stroke patients. The Excel Cryo Cooling device drops brain temperature by cooling the blood in arteries in the neck. The device is a neck collar with a cooling pack which when shaken can reach low temperature within seconds. The collar is placed around the patient's neck and the cooling pack is applied to the front of the neck and held in place. This device provides stable cooling irrespective of participant size or weight. The objective of this study is to test the value of using Excel Cryo Cooling device in dropping brain temperature in 3 different groups of adult participants: