Expert Riddles

What comes once in a minute, twice in a moment, but never in a thousand years?

Seven men have seven wives. Each wife has seven sacks. Each sack has seven cats. Each cat has seven kittens. How many legs are there in all?

What loses its head in the morning and gets it back at night?

Using only addition, add eight 8’s to get the number 1,000.

You have two identical ropes that burn irregularly. Each rope takes exactly 60 minutes to burn completely. How can you measure 45 minutes?