An authority on the English language has set us free from the tethers of what many have long regarded as a grammatical no-no. Or has it? The answer depends on how you side with a declaration from ...

NPR's Ari Shapiro speaks with John McWhorter, Columbia University linguist and New York Times columnist about the recent Merriam-Webster declaration that English sentences may end with prepositions.

Prepositions are words that show the relationship between a noun and something else in a sentence. Words like 'on', 'under' and 'inside', as well as phrases like 'next to', 'in front of', and 'on top ...