Volunteers will not participate in any part of cancer treatment, diagnostic imaging tests (CT, PET, etc), or any other clinical procedures in MD Anderson. Volunteers will not need to see physicians at MD Anderson or elsewhere. Thermal images will be taken 4 times during one day for a volunteer (morning, midmorning, earlier afternoon, late afternoon). Volunteers should not take any medications or perform any other medical procedures from morning to late afternoon until the thermal imaging is completed.