科学美国人60秒 SSS 2013-09-06（在线收听）

 We've already known that human population can get taller over time but the new study shows just how extreme this growth ---- can be. Economic storyian   timidly had a university access in   Australian national university. Exam the tight changes in the relatively short time period and small geographic region. His data sample consisted of adult male around 21 years old who were born in 15 EU countries between 1856 and 1980's the study was published in the Oxford economic papers. Over the century and the third average had increased by about 11 centimeters a good half a head. But why? according to H improvement in sanitation and housing reduced and child diseases. The result is healthier and much taller children. Other factors include increased health, education and social health program. Smaller family which ensured that each child had more to eat may have played the role as well. In general its population is a marker for better health. So congratulation to EU. Keep live in large