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How far can we control the outcomes of our actions?

Economist Robert Frank says that competition is not always benign and that if we want to understand some of its negative results we should look to Charles Darwin for explanation.

Soprano Claron McFadden discusses how far she can control audience reaction when she is performing on stage.

And environmental scientist Peter Liss says we need a lot more data before we can decide whether pumping chemicals into the skies and oceans can really help solve global warming or just creates a new host of environmental problems.

Illustration by Emily Kasriel: the monied hand of the individual controlling the life of the planet, to the sound of music.