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Tyrannosaurus rex spanned all of ancient North America, and about 20,000 lived at once. Roger Harris/Science Photo Library vie Getty Images

How many Tyrannosaurus rex walked the Earth?

Using the incredible wealth of fossil data and a modern ecological theory, researchers estimated population density for the extinct apex predator.
A solar water heating unit on the roof of a home in Kuyasa outside Cape Town. South Africa has a long way to go to get people off the grid and onto solar heating. Epa/Nic Bothma

Advances in getting solar onto the grid, and into the home

Africa is blessed with an abundance of sunshine.Given the heavy demand for energy, alternatives, such as solar, could provide solutions and help stimulate economic growth.

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