Genetic testing is becoming more common, even for people who show no outward symptoms of a disease. Do you think it’s beneficial to know whether you carry a mutated gene? Are there are any negative consequences?

On a spring day, a middle-latitude city (about 40? north latitude) has a surface (sea-level) temperature of 10 ? c. if vertical soundings reveal a nearly constant environmental lapse rate of 6.5 ? c per kilometer and a temperature at the tropopause of –55 ? c, what is the height of the tropopause?