Affectionate and aggressively earnest, these follow-up messages — dubbed “millennial thank you notes” — are flooding group chats and inboxes with a tidal wave of feelings.

Even the classic smiley face isn’t always safe territory: the degree of a smile and the shape of the emoji’s mouth can send subtly different signals, and generational divides only add to the confusion ...

The 109th running of the Indianapolis 500 roared to life on Sunday at the 2.5-mile oval of Indianapolis Motor Speedway. A ...