It isn’t every day that the House of Representatives takes bipartisan action to reverse a policy that’s been in place for two decades. But that’s what happened last month, when Democrats and ...

Does an identity have to be unique? I think we’ll get little argument if we claim that, within a given context, an identity (that is, some distinguishable object) must have a unique identifier.

Your medical records probably bear different numbers — one for your primary care physician and his or her medical group, one for each hospital you’ve been treated in, different ones for different ...