JUST 2% of the world’s human-genome catalogue represents people of African origin. A massive sequencing project aims to uncover untold genetic diversity and overlooked disease risks. Also, a new study shows intense exercise is a risk factor for ALS, the most common form of motor-neuron disease. And, the return of cicadas in America bodes ill for children’s well-being. Kenneth Cukier hosts. Runtime: 29 min

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