"Manfred Bietack also reminded us, ‘It is a great illusion to believe that sciences are more reliable, at least just now, in obtaining absolute dates especially when the data available is so limited…even more by the subjective selection process of the author’s…Radiocarbon years do not correspond to calendar years due to unsteady cosmic radiation and uneven absorption of carbon 14,’ which is ‘explored by calibration…by taking a series of well dated trees…subjecting to measurements…[which] involves a lot of interpretation’ and ‘which can also vary between different laboratory conditions…fragments of wood are likely to be old and re-used when deposited…contamination and pre-treatment in laboratories can be looked on as yet another complication which has not been sufficiently resolved.’"