Iron pin may have held in place a wood or bone prosthesis.
The bones of seven huge dinosaurs that each weighed more than a dozen elephants and had femurs bigger than a human adult have been discovered in Argentina.
The US study is the first time such a development has been shown in an animal that is similar to humans.
After 26 years of research, scientists confirm that the bones interred at Charlemagne's supposed resting place belong to the emperor.
Microscopic particles embedded in DNA insert bone-producing instructions into cells.
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