A team of scientists at Tel Aviv University who have been excavating a cave in central Israel told the media on Monday they found teeth that were roughly 400,000 years old – twice the age of bones found in Ethiopia that were at one point thought to be the oldest. If their claim turns out to be true, these new remains would be the oldest known human bones on Earth. Our image of evolution would change substantially.

Some experts think that it’s premature to say that the remains are from modern humans, however. More testing will be required before the scientific community accepts the find as anything more than a significant discovery of bones from our ancient relatives.