Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

Question: In a heat map, what color represents the hottest temperatures? Answer: bright yellow
A heat wave over the United States as indicated by heat radiated from the ground. The bright yellow areas are the hottest, and the blue and white are coolest.

Question: How many dimensions can humans see in? Answer: three
Humans can see in three dimensions and color.

Question: What type of isotopes have short half-lives and are given in very low doses? Answer: radioisotopes
Radioisotopes are widely used in medical diagnosis. These isotopes need to have short half-lives so that they can be administered in very low doses, thus minimizing damage to cells.