| http://www.w3.org/ns/prov#value | - geoff of the central coast, using your criteria for what ??????proof ?????? of anything is [ 100% certainty ] how do you know there was a medeival warm period, how do you know it was warmer than today? how do you know that dinosaurs existed, seeing that you were not there at time? maybe their fossils were placed in the ground by aliens? all sounds silly doesnt it? no such thing as a 100% certainty
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