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Jo didn’t know she wanted children until she learned that cancer had likely ruined her chances to have them.Dared by her friends to try online dating, Jo meets a man who would be perfect—if not for his obvious desire for a family and her too recent cancer scare.Instead, Pike’s team turned to uranium-series dating, another radiometric method.Uranium-238 decays through a series of isotopes to uranium-234, which then itself decays to thorium-230.Yet cave paintings are generally considered to be physical traces of early modern behaviour, because the creation of art requires abstract thought. ‘The reason we started to look at dating cave art was because we had this slight conundrum,’ says Alistair Pike, an archaeologist at the University of Southampton in the UK.

To get a clearer picture, scientists are exploiting diverse physical phenomena, from uranium’s radioactivity to life’s preference for l-amino acids.However, it quickly became clear that something wasn’t quite right.‘As is always the case, a new dating technique comes along and everyone latches onto it,’ explains Walker.‘We’re kind of at the mercy of geochemistry.’Pike’s team used this method to give a minimum date to red hand stencils found in a cave in northern Spain called El Castillo, which contains the oldest known cave art in the world. This is long after humans were supposed to become anatomically modern, adding to the evidence suggesting that early anatomically modern humans didn’t necessarily act modern. Anatomically modern humans arrived in northern Spain around 42,000 to 43,000 years ago, and Neanderthals died out between 39,000 and 41,000 years ago.But because the stencil date is a minimum age, there’s a chance the Neanderthals could have been the artists.

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