Count the number of lines in the image below ?

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

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

The more of this there is, the less you see. What is it?

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

Find the hidden panda in the image below.

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.