Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?

I have an eye but still cannot see.

Who am I?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

One day, I thought of ways that can be used for creating a palindrome. So I decided that I will turn into a larger number by adding the reversed digits to the original number and keep doing it till I finally obtained a palindrome.

I am not sure if this process will always result in a palindrome eventually but I was able to produce a four-digit palindrome. Can you guess my starting number?

What can you deduce from the following BrainBat?

CRY
LMKI

John is a strange liar.

He lies on six days of the week, but on the seventh day, he always tells the truth.

He made the following statements on three successive days:

Day 1: "I lie on Monday and Tuesday."
Day 2: "Today, it"s Thursday, Saturday, or Sunday."
Day 3: "I lie on Wednesday and Friday."

On which day does John tell the truth?

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?

Move three sticks of the spiral below to form a square.