why number 8549176320 is one of a kind?

Find the number of squares in the below picture

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

What has 13 hearts but no other organs?

There are 100 bulbs in a room. 100 strangers have been accumulated in the adjacent room. The first one goes and lights up every bulb. The second one goes and switches off all the even-numbered bulbs - second, fourth, sixth... and so on. The third one goes and reverses the current position of every third bulb (third, sixth, ninth? and so on.) i.e. if the bulb is lit, he switches it off and if the bulb is off, he switches it on. All the 100 strangers progress similarly.

After the last person has done what he wanted, which bulbs will be lit and which ones will be switched off?

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

Keyboard words are not in alphabetical order, Why?

Move four matchsticks to the below square to form three squares?