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

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

There is one four-digit whole number n, such that the last four digits of n2 are the original number n

What is at the end of a rainbow?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Highly detail-oriented individuals excel at this type of optical illusion challenge. It requires not just good eyesight but also the ability to distinguish subtle differences quickly. Finding the 6 among all these 9's could indicate a high level of IQ and superior observational skills.