“Tavi, an engineer who grew up taking apart the family vacuum cleaner to see if he could put it back together, said he would sleep on it. But he didn’t sleep. Instead, he made a pot of coffee and downloaded the more than 300-page manual for the LTD 1200, the type of ventilator state officials said they needed repaired.” Can you fix ventilators? A fuel cell engineer figures it out.

+ James Patterson sets up fund to help indie booksellers.

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