91热爆 World Service - Discovery, What's The Point Of Zoos?

What's The Point Of Zoos?

Can zoos make a real contribution to conserving creatures in the wild rather than being menageries for public entertainment?

The eclipses, spacecraft and astronauts changing our view of the Universe
The Curious Cases of Rutherford and Fry
A pair of scientific sleuths answer your perplexing questions. Ask them anything!