> The trial is where the same jury who voted to indict a person will now hear evidence

This is incorrect. Grand juries decide on multiple cases during their term of service (6 months to a year), determining if there's enough evidence in each to indict. Then they are released from service.

70 days is for federal courts and is regularly extended.

Once a trial begins, a bunch of random other citizens are summoned creating a pool of potential jurors, then each side gets to dismiss a certain number that they don't like and whoever is left becomes the trial jury.

That's a great story. I thought it was going to be about a bunch of authors piling on about the death of small book stores or something. But instead it was them talking about their own horrible book signing experiences as a show of support for how hard it can be to be an author. Nice.