these words they are already hearing at school you bring it together and it becomes a world view. a lens. and that's the scary part. rachel: absolutely. all right. well, coming up, growing concerns about a new heavily mutated covid strain prompting the biden administration to restrict air travel from south africa. so what do you need to know? dr. marty makary puts it all in perspective next. ♪ ♪ walmart's deals for days isn't over yet. this cyber monday is your last chance to score big online starting sunday night. don't miss out on walmart's deals for days. ♪ ♪ >> man: what's my safelite story? my truck...is my livelihood. so when my windshield cracked...