A brilliant star in our nearest galactic neighbor didn’t go out with a bang, it simply faded from sight, leaving scientists to piece together what could make something so massive vanish so quietly.

A long-running study of more than 131,000 adults links moderate caffeinated coffee or tea intake with a slightly lower risk of dementia and slower cognitive decline. Here is what it found, and what it does not prove.

It started with a handful of unusually tiny bones in Spain, and now researchers say they may point to a plant eating dinosaur that does not fit where it is supposed to on the family tree.