I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

Can it be possible to build a house that has all its four walls facing towards the South?

Buy me, smell me or deliver me, I do not change.

Who am I?

There is something which is always coming but never arrives?

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

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

The cream is heavier than Milk. True or False?

What begins with T, ends with T, and has T in it?