Be active and find the killer in the picture Riddle below.

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

what's the probability of getting a king or a queen from a pack of 52 cards?

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

A sundial has the fewest moving parts of any timepiece. Which has the most?

Do You See It?

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

There are 3 apples in the basket and you take away 2. How many apples do you have now?

A man dies of old age on his 25 birthday. How is this possible?

John speaks the truth only once a day in a week. Below are a few hints for you:

First: Days are Sunday, Monday and so on.
Second: One day he says, "I lie on Monday and Tuesday".
Third: On the next day, he says, "Today is either Thursday, Saturday or Sunday".
Fourth: On the next day, he says, "I lie on Wednesday and Friday".

Can you identify the day on which he speaks the truth?