>> customers expect us to save the money, they need us to save them time. when it comes to saving time, what better way to do it than bh drone. >> reporter: zip line is part of a growing list of companies looking to commercial drone delivery more accessible. each zip returns to home base and hooks itself to this suspension cable, where it awaits its next mission. currently the service is free. no cost to customers as wal-mart and zip line gather data to find out if this is something people ant. expectations is this service could expand across the country. >> reporter: tony. >> dokoupil: heads up if you live in northern arkansas. errol, thank you very much. tonight the united kingdom says it will restrict travel from south africa after scientists discovered a potentially dangerous new variant of the coronavirus. few than 30% of south africans have had a covid shot, but researchers there are trying to reverse engineer the moderna
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