Can you find out the total number of triangles in the given figure?

Why are televisions attracted to people?

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Find the value of "a" by solving the maths equation in the picture below:

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

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

Readers with the highest levels of visual skills can find three differences between the pictures of a lion on a scooter. Test your visual prowess now!