Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

The cream is heavier than Milk. True or False?

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?

Which city is three-fifths chick two third cat and 50% goat?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

You are playing a game with your friend Jack. There are digits from 1 to 9. You both will take turn erasing one digit and adding it to your score. The first one to score 15 points will win the game.

Would you want to play first or second?

PS: The sum should be exactly 15.

The day after tomorrow will be three days before Tuesday. Can you find out what is today?