美因何而存在？为了回答这个问题，鸟类学家理查德?O?普鲁姆正试图令达尔文的一种观点重新流行：同一个物种中，动物对其同类的吸引力，不仅仅与健康和良好的基因有关。动物，尤其是普鲁姆博士所研究的鸟类，会做出主观的决定。他希望进化生物学家不要再“为欲望辩解”了。
Besides exploring the overall ranking, prospective international students can narrow their search by browsing regional and country rankings. These rankings were determined solely by how schools performed in the overall list.
Justin Bieber rounded out the top five, honoured for his work with Pencils of Promise and his Believe Charity Drive.
Am I tempting fate by wondering if the Lakers end up in this conversation within a couple weeks? They'd have to go on a truly epic slide to be bad enough to keep their draft pick at this rate (top-three protected to Philly) but I think the question is whether they should continue to build slowly around this core or flip one or two of the young dudes for a star.