156. What does the yellow diamond on the NFPA 704 fire diamond represent?
157. Human cells typically have how many copies of each gene?
158. Autosomal-dominant Compelling Helio-Ophthalmic Outburst syndrome is the need to do what when seeing the Sun?
159. Rhinoplasty is a surgical procedure on what part of the human body?
160. What is the half-life of Uranium-235?