1. On both carotid artery on left and right of the neck. 2. On both superficial temporal artery on the left and right of the forehead. 3. It is expected that skin thermal variation at the forearm will always be in a relation to the blood flow in carotid artery for a healthy person that could be used as a signature marker for an individual to make comparison. Therefore, temperature mapping of the left forearm (upper limb).