Over the past century, religions have seen their fair share of growth spurts and declines. Imagine each religion as a unique club that people join. Some clubs become incredibly popular, while others lose members over time. To really understand how these clubs change, scientists used a special math equation that usually describes how crystals grow. They looked at 58 ...

The Denver Broncos will need to keep the Baltimore Ravens' powerful run game in check. The Ravens' explosive runs account for 19% of their total rushing yards, making them one of the top teams in the league. The Broncos, however, are no pushovers. They've been solid against the run, allowing just 11% of their opponents' rushing attempts to go for 10 or more yards. I...