It’s the most iconic sign of autumn: leaves change from green to a brilliant array of reds, purples, oranges, and yellows that all too quickly fall to the ground. But what causes this process to happen? Mach explains. » Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC » Watch more NBC video: http://bit.ly/MoreNBCNews NBC News Digital is a collection of innovative and powerful …

The photo captures labor and delivery nurse Caty Nixon grieving another family’s loss — a stillborn baby she had helped to deliver. Nixon’s sister Laura took the picture and posted it on Facebook, eliciting a viral flood of online encouragement. » Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC » Watch more NBC video: http://bit.ly/MoreNBCNews NBC News Digital is a collection of innovative …

Kelly Stafford, wife of Detroit Lions quarterback Matthew Stafford, has a message for moms as she battles back after undergoing a 12-hour surgery in April to remove a brain tumor. WATCH THE FULL EPISODE OF ‘WORLD NEWS TONIGHT’: https://bit.ly/33Ke1Hv WATCH OTHER FULL EPISODES OF WORLD NEWS TONIGHT: http://abc.go.com/shows/world-news-tonight #WorldNewsTonight #BrainTumor #KellyStafford #MatthewStafford source