There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

Which Travels Faster? Solve below famous picture riddle:

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

What do you call a fish without an eye?

What 8 letter word can have a letter taken away and it still makes a word. Take another letter away and it still makes a word. Keep on doing that until you have one letter left. What is the word?

What number divided by 4 is the same as that number minus 4?

How can you take 2 from 5 and leave 4?