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On Monday, the FDA approved a new drug for Alzheimer’s disease—the first in nearly two decades. Biogen’s aducanumab aims to slow the cognitive decline often associated with the disease.

It’s clear the virus can get very close to the brain. What’s less certain is whether virus is able to penetrate deeper and invade it.

Lou Gehrig’s worst full season was his best as amyotrophic lateral sclerosis, or ALS, was beginning to erode him from the inside.