workers are staging a walkout against president macron s plans to overhaul france s retirement system. protests are mostly peaceful, but police fired tear gas at small groups of rioters. there is new debate tonight over a drug that aims to be the first medication to slow mental decline from alzheimer s disease. well, today, the drug maker, biogen, said its alzheimer s drug deserves serious consideration from the f.d.a. biogen recently stopped testing the drug after determining that it wasn t effective, but in a reversal, the company says new evidence presented today shows the drug can possibly slow alzheimer s by removing harmful plaque from the brain. up next, what you didn t know about civil rights icon rosa parks. l rights icon rosa parks.