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Dietary calcium is necessary to ensure our bones hold on to all the calcium they need to stay strong. Incase/Flickr

Explainer: how do our bones get calcium and why do they need it?

If dietary calcium is in short supply, calcium is released from bone to maintain the critical level in the bloodstream needed for nerve and muscle function.
The force on a triple jumper’s bones is 15 times their body weight. www.shutterstock.com

What exercise does to your bones

Studying how athletes' bones contort during exercise is helping scientists understand which exercise is best for maintaining healthy bones as we age.
Impala drink at a waterhole in South Africa’s Kruger National Park. Milk used in paint nearly 49,000 years ago could have come from their early antecedents. EPA/Jon Hrusa

Paint gives clues about the ingenuity of ancient culture

It may have been a cultural tradition to use tempera paint that contained traces of milk on bodies according to a discovery at Sibudu Caves in KwaZulu Natal.

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