...is wreaking havoc again. This morning I found the following on the BBC website, of all places, in an article about a dual-gender butterfly (yes, really).
"[The butterfly] is already middle-aged at three and a half week's old."
If even the BBC can't grasp the basic use of apostrophes, then the rest of us have absolutely no hope! And no wonder I saw this sign on a chalk-board outside a local restaurant a few weeks back: