Olff Hossill, email

TWO friends go to the natural history museum one day. They come across a display featuring the reconstructed skeleton of a large dinosaur. One of the men tells his mate: “This dinosaur is two billion years and 10 months old.”

“That’s a very exact figure,” the friend replies.

“How do you know that?”

The first man replies: “Simple. The guide told me it was two billion years old when I was here 10 months ago.”