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.

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

Deane and Rob make and test a string telephone with two plastic butter containers. Also, a matchbox string telephone is shown.

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.

In Queensland, Australia, deadly jellyfish keep you out of the water just when the weather makes bathing most attractive, but how do these tiny creatures pack such a lethal punch? Rob makes a simple model that shows how their stinging cells work.

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.

Waxwork flowers were once extremely fashionable. Not many people do them now, but Rob shows how to make simple wax flowers with a candle - and takes a quick look at some vegetable creatures!

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

This is obviously a set of something, but what do you think it is?

Rob shows how the eye works to create a blind spot in everything we see, and how we get the illusion of light simply from pressure.

How does the brain decipher a picture? Rob shows the importance of masking and perspective in creating illusions of reality

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

Where does a nice cup of tea begin its journey? Deane and Rob visit the Nerada Tea Plantation in Queensland, Australia, where they explain how tea leaves are harvested, processed and packaged.