However, surgeons must be well-trained in the principles of the operation, and good follow-up care is essential so the surgery won't fail.

CNN: A fate worse than death for scores of African women

This unusual approach gives Mr Pohl the freedom to delve into an extraordinarily diverse range of topics, including the operation of neutrino observatories, the physics of rainbows, the principles of plate tectonics, and how to search for fossils in your office's marble lobby.

ECONOMIST: Good sport