1,Air! Putting air in a bucket will make it weigh less because air is less dense than the air that was already in the bucket. You’re essentially replacing the heavier air with lighter air. It’s a clever riddle that plays on the laws of physics.
2,A letter! A letter can be seen but never found because it’s hidden within a word or sentence. The only time a letter can be found is when the word or sentence is unwound, or broken down into its individual letters. So a letter is “only hidden in the unwound.” Clever, right? 😉

1,The correct answer is ‘a hole’. It doesn’t have any weight and can be seen easily, If we make a hole in a bucket, everything will come out of it and make the bucket lighter.
2,Relaxation

1,hole
2, What can be seen but never found that only hides in the unwound? Answer: Relaxation.

1. what you can in a bucket to make it weigh less a hole
2.relaxation