What English word has three consecutive double letters?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

What can go up a chimney down, but can’t go down a chimney up?

What building has the most stories?

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

Spot 5 differences in two Christmas tree below:

There are three boxes of different sizes with three cupcakes inside each of the boxes in Christina's kitchen. At night her daughter wakes up and goes to the kitchen. She opens a box and eats all three cakes.

But in the morning Christina finds out that each box still had three cupcakes. How?

Spot the cat in the picture below