Innumerable examples of evolution in action can be seen all around us, from the pollution-matching peppered moth to fast-changing viruses such as HIV and H5N1 bird flu.

• 数不清的进化在行动的例子可能就发生在我们周围，从适应污染的斑点蛾到日新月异的病毒，诸如艾滋病毒和H5N1型禽流感。