What always comes into a house through the keyhole?

There are nine dots in the picture that has been attached with this question. Can you join all the dots by drawing four straight lines without picking up your pen?

I guess 76.8% of readers will like this riddle.

What's the least number of people should read this post?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

Which number comes next in the number series?

2, 9, 30, 93, ?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

What makes this number unique: 8,549,176,320?

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

I know a nine-letter word having only one vowel.
Do you ?

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?