full episodes downton abbey

This story that Rob has found in the paper seems impossible - what do you think?

This story that Rob has found in the paper seems impossible - what do you think?

Joke cards are popular, so Rob shows how to make one that will give anyone opening it a noisy surprise

Rob discusses and illustrates some of the main composition rules that have been used by major artists.

Rob shows you some of the most common corals; brain, staghorn, mushroom and so on, but also a surprise inclusion, not made by coral polyps at all.

A match pushed through a hole in a board magically jumps to another one. As Rob shows, it is an easy trick to set up.

Deane provides a match stick puzzle to try at home.

These old pincers look ferocious but, as Rob explains, they were really a safety device. What do you think they were for?

Deane presents puzzles which require viewers to fold and wrap pictures in the mind.

Optical illusions are fascinating. Rob shows how by cutting and moving card strips of your own you can explore the illusions of how some straight lines look longer or shorter than others of the same length

Can there be such a thing as frothy rock? Rob explains how it is formed under the sea by volcanos, trapping so much steam and volcanic gas that it floats

Deane describes the origin of the Marathon running race.

Bird behaviour often involves head-bobbing signals that mean different things. Simple models made from empty soft drink cans and paper create head-bobbing birds of your own

Here's a little trick with numbers in which Rob shows how, even if you start with an unknown answer, subtracting, reversing and adding means that you end up with the same predictable answer.

Rob provides an interesting take on clapperless bells and musical glasses, and shows how the principle was once used in instruments favoured by some of the world's greatest composers.