As debates over vaccinating children rage and the Delta variant of covid-19 surges in many countries, what impact will the return to classrooms have on the covid-19 pandemic? Also, our science correspondent Alok Jha asks ecologist Meg Lowman about the secrets that can be revealed by exploring the treetops. And the northern white rhino is nearing extinction, but can technology bring this species back from the brink? Kenneth Cukier hosts. 

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