“The Chicago Manual of Style explains it this way: If you write ‘My older sister, Betty, taught me the alphabet,’ you are implying that Betty is your only older sister. But if you write ‘My sister Enid lets me hold her doll’ – with no commas around the name – Enid is not your only sister.” Commas thus become facts that need to be checked. But “[how] much time should you spend finding the answer – commas or no commas – to a question nobody’s asking?”