I’m tall when I’m young, and I’m short when I’m old. What am I?

What has one letter and starts with an E?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

I am the fastest animal but cannot climb the tree. 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?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

I have an eye but still cannot see.

Who am I?

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?

Which is the correct shadow of the bird?