What building has the most stories?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

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

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

What does below Rebus mean ?

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You are provided with a grid (as shown in the picture). Can you fill the squares with numbers 1-8 in a manner that none of the two consecutive numbers are placed next to each other in any direction (vertically, horizontally or diagonally?)

Write the next letter in this sequence.
O, T, T, F, F, S, S, E, __
**Hint: It is a Number Series Puzzle

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

A pregnant woman is preparing to name her seventh child. Her children's names so far are Dominique, Regis, Michelle, Fawn, Sophie, and Lara. What will she name her next child -- Jessica, Katie, Abby or Tilly?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?