What is always in front of you but can’t be seen?

Can you make four (4) nines (9) equal 100?

Jessica is telling her friends this story and asks them to guess if it’s the truth or a lie: “There was a man sitting in a house at night that had no lights on at all. There was no lamp, no candle, and no other source of light. Yet, he sat in the house and read his book happily.” Her friends say she’s lying, but Jessica corrects them and says she’s telling the truth. Jessica’s story is true—but how?

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
----------

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

What has a bottom at the top?

A father's child, a mother's child, yet no one's son.

Who am I?

What has 13 hearts but no other organs?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?