Add Yahoo as a preferred source to see more of our stories on Google. As the holiday season gets underway, many parties and gatherings might include a gift exchange. Along with Secret Santas and ...

The gift-giving season is upon us, which means the return of a controversial holiday game: the White Elephant gift exchange. Whether you call it White Elephant, Yankee Swap or Dirty Santa, the premise ...

Source: Martinvl, via Wikimedia Commons. Play behavior can be a delicate balance between cooperation and competition. In apes and monkeys, a relaxed “play face” signals that one’s intentions are not ...