An Arkansas server says she was fired after getting a $4,000 tip from a generous table but the restaurant is disputing her claim. NBC News’ Maura Barrett reports. » 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 news brands that deliver compelling, diverse and engaging news stories. …

GRAIL, a Silicon Valley startup, created the Galleri test, which can screen for more than 50 cancers by looking at blood for DNA shed by cancer tumors. If it sees that DNA, then it predicts where the cancer is. A positive result isn’t always accurate, but researchers at the National Cancer Institute say study results so far could potentially revolutionize …

Stay up to date on the developing stories making headlines. Original source (ABC/Youtube)