The words in Group A share a common property that only one word in Group B satisfies. Which one is it?

Group A:
Chains
Countess
Stained
Schooled
Purring
Corny

Group B:
Reaction
Penned
Spoiled
Stints
Putting
Hurry

Jordan, Justin and Jeff are brothers whose ages are 29, 30 and 31 (in any order). Your job is to determine the brothers' ages from the clues below. There's one catch though....only ONE clue is true. The rest are false. Good luck!

1. Justin is 30
2. Jordan is the youngest
3. Jordan is 31
4. Justin is one year older and one year younger than his brothers.
5. Justin is not the youngest.
6. Jordan is not two years ...

A hiker climbs all day up a steep mountain path and arrives at the mountain top where he camps overnight. The next day he begins the descent down the same trail to the bottom of the mountain when suddenly he looks at his watch and exclaims, "That is amazing! I was at this very same spot at exactly the same time of day yesterday on my way up."

What is the probability that a hiker will be at exactly the same spot on the mountain at the same ...

What popular Christmas carol nullifies itself by the singing of its first line?