A team of over 60 scientists have worked out the age of fossil remains that may be one of our early ancestors.
The skull and other bones were found in rubble from caves in South Africa in 2008.
The fossil shares some features with a later species called Homo Erectus which walked upright, and an earlier one called Australopithicus which had a smaller brain size to us.
The dating shows that the early man fell into the cave nearly 2 million years ago, and this new find could show the stage of evolution in between these two species of early human.
One of the ways that the age of the fossil was worked out was to look at the record of the Earth's magnetic field locked into the rocks found above and below the fossil remains, and match the direction of the field at that time with other rocks.
This is possible because the magnetic field flips from North to South pole every million years or so, and so a pattern, like a barcode, can be made up and used to work out the date of a rock or fossil.
This work was done at the Geomagnetism Laboratory, University of Liverpool by Dr Andy Herries from the University of New South Wales, Australia.
Since this work was finished, the team have found more fossil remains, including those of a large-toothed cat!