I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

I know a nine-letter word having only one vowel.
Do you ?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

I have an eye but still cannot see.

Who am I?

What is the Surname of Barbie Doll?

Why 1729 is a magic number? Answer Logically.