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There's been a lot of back-and-forth about the efficacy of the Covid-19 vaccine - which, reminder, while everybody here is highly educated in law, nobody is an epidemiologist - and Justice Elena Kagan went hard at Ohio solicitor general Ben Flowers.

You said we understand that 18- to 29-year-olds, even though they're not going to die or end up with very serious injuries, they can spread. You don't doubt that, that they can spread to other people who are more vulnerable?" Kagan asked Flowers.