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The sun is a protector, a nourisher and a giver of life to all the planet's creatures. But as this episode shows, it can also be a tyrant - no more so than at the equator.
The time of year when Africa's savannah bakes under the equatorial sun - which requires a drastic change for the equator's usually seasonless conditions.
A look at the areas of the equator where the sun is challenged by snow and ice, meaning the animals and plants below must adapt or die.