These pictures show young readers what led Darwin to form his great discovery: the evolution of species through natural selection.

VOA: special.2009.02.27

I just go down the list selecting the smallest person at a time and then I repeat, repeat, repeat but when we actually did out the math or kind of reason through it, the running time, the asymptotic running time of bub-- of Selection Sort was also what?

只需要遍历列表，每次找出最小的元素,然后重复上述步骤，但从数学角度看,选择排序的时间复杂度,又是多少呢？

哈佛公开课 - 计算机科学课程节选

He developed the theory of evolution that life on Earth developed through the process of natural selection.

VOA: special.2009.12.16

On stage,Milner tells the story through music. Darwin's theory of evolution through natural selection inspires some tunes,and episodes in his life inspire others.

VOA: standard.2009.11.25