Deciding when to use an em dash instead of some other punctuation mark is largely up to you—except in situations that call for an en dash or hyphen.
First, you have to understand the difference between England and Britain (and the UK, while we’re at it).
Knowing your equines is no mere horseplay. Here's how to tell the difference between horses, ponies, and even miniature horses.
The Dilemma: At a cocktail party, a nasty brute spills a drink on you. You'd like to compare his manners to those of a more primitive hominid. But which would be more insulting?