 What we found is engravings in a shell which is 400,000 years old. This is the oldest engraving that we're aware of, way older than we expected for this type of engraving. The location and the age of this really means that the most likely candidate for making these engravings is Homo erectus. So this earlier species, Homo erectus, to be associated with these types of engravings really pushes back the date when we can start talking about these cognitive abilities that allowed a species to engrave a deliberate, abstract, geometric sort of pattern. Previously we're thought to be in the domain of Homo sapiens, possibly Neanderthals as well. This had never been discovered before, even though these shells were collected more than 100 years ago by Eugene Dubois in the 1890s, even though they were studied in the 1930s and even when I took the photograph itself I never saw it. It only came up in the digital image, but once I opened up that picture the first time I saw it it was immediate. Those are engravings that have no other natural explanation. So there was two different dating methods used and we had dating experts in Europe who have done these datings. They feel somewhere in that age of about 500,000 years old or half a million years old. This is unexpected for Trinil. People actually thought Trinil was older than that. So this will cause a rewriting of the age and people to re-evaluate the age of not only Trinil but other sites in Java. Finding this particular bivalve of shellfish in the hands of Homo erectus being engraved, used as tools and proven to be a food resource I hope will encourage other scientists to look at shellfish as really a potentially important element in human evolution.