Why Aeroplane windows are round?

Can you name an animal whose killing cannot be performed without spilling your own blood?

These types of puzzles are known as charades. What you have to do is to find two words that are referred to in the first stanza and the second stanza and put them together to form the third word in the third stanza.

Just for example, if my first refers to 'off' and my second refers to 'ice', then my whole will be the 'office'.

My first is present - future's past -
A time in which your lot is cast.

My second is my first of space
Defining people's present place.

My whole describes a lack of site -
A place without length, breadth, or height.

Can you replace the question mark with the correct number in the below table sequence?

An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?

what does this picture(rebus) riddle means ?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

What does a man do only once in his lifetime, but women do once a year after they are 29?

How many triangles are there on the puzzle below?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?