full episodes downton abbey

In the central Australian desert, two famous tourist attractions were created by flowing water in the remains of an ancient seafloor. Rob and Deane explore Standley Chasm and Simpson's Gap near Alice Springs, and reveal the formation of these natural marvels.

Stone is hard to carve, but very easy to model, as Rob shows. This is an excellent, inexpensive and simple way to create :stone" in model landscapes and railway layouts.

Look at your reflection in a spoon. On the convex side, just like Rob,you appear up the right way, but in the concave bowl, you are upside down. Why?

Deane and Rob explore a puzzle with fractions - and find a surprising answer!

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.

Deane demonstrates a simple technique for finding compass directions without a compass.

Folk toys have persisted unchanged for hundreds of years but, as Rob shows, they are much easier to make with modern materials.
This is a classic folk toy - in various forms.

Deane and Rob present challenging puzzles involving loops and chains made from coloured woollen thread.

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.

There are various forms of invisible ink, but Rob shows a different way to send an invisible message.

Deane provides a match stick puzzle to try at home.

Rob deciphers this impossible coded message easily with red cellophane spectacles.You can easily do the same.

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

Roadside reflectors are called "cat's eye" reflectors because they bounce light back so well at night, but reflective clothing and road signs do it just as well, thanks to thousands of tiny glass beads that can bend light rays back on themselves.