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Darwin wondered: what if species change over time in response to their environment? Shutterstock

Curious Kids: how do scientists know evolution is real?

In science, we look at the evidence and try to find the theory that best explains it. And that’s what happened when it came to figuring out evolution.
Professor Lee Berger from the University of the Witwatersrand holding the skull of Homo Naledi. EPA/Shiraaz Mohamed

Homo naledi may be two million years old (give or take)

The big question being asked is: where does Homo naledi fit in the evolutionary tree? Assessing the similarity or dissimilarity between fossil skulls has provided a possible clue to the answer.
The skull of Homo naledi is built like those of early Homo species but its brain was just more than half the size of the average ancestor from 2 million years ago. SUPPLIED

Homo naledi: determining the age of fossils is not an exact science

Despite claims about its age, puzzling combinations of features from Homo naledi gives it an uncanny resemblance to human beings.

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