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

There's a day, that comes around once a year.
To celebrate the man, you hold dear.
He gave you life, love and will pick you up if you fall.
When it comes to guys like him, He's the best of all.
Who is he?

Count the number of lines in the image below ?

Kareena is older than Bipasha. Bipasha is younger than Karishma and younger than Katrina. Katrina is older than Kareena and Alonso, who are older than Karishma.If Alonso and Kareena are twins, who's oldest?

What has one eye, but can’t see?

You need to move three matchsticks to form three squares. Can you do it?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

f you were running a race, and you passed the person in 2nd place, what place would you be in now?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?