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PLUS: There’s a fatty liver epidemic—AI could help get ahead of it. View in browser | Your preferences SUBSCRIBE FOR FULL ACCESS If you had access to a cure for a health problem that scientists are pretty sure works but aren’t so sure how, would you take it? That’s the subject of this week’s newsletter. Emily Mullin met with researchers using ultrasound instead of a scalpel to treat people with substance abuse disorders. Ultrasound is the imaging tool best known for checking fetal health. But a neurosurgeon at West Virginia University has pioneered the use of it to stimulate the brain in a way that can...