I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

I inserted a coin in a bottle and closed its mouth with the help of a cork. Now, I was able to take the coin out from the bottle without taking out the cork or breaking the bottle. Can you tell me how I did it?

What is the word or phrase?

Find the next number in the sequence

5 12 24 36 ?

Can you count the number of triangles in the picture below?

It is a 5 letter word if you take away first letter it is something you get from sun, if you remove second letter you will get something to eat, if you remove third letter you get a word you use in pointing at and if you remove the fourth letter you get something to drink. What is it?

Can you make a fire with just a single stick?

A sundial has the fewest moving parts of any timepiece. Which has the most?

Why do you find that most of the buildings are deprived of the 13th floor?

Can you spot the hidden girl in the picture below?