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!

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.

In Australia's outback, many have died for lack of water but, as Rob shows, there is sometimes water there if you know where to look, and knowing where to look for it could save your life.

In Australia's outback, many have died for lack of water but, as Rob shows, there is sometimes water there if you know where to look, and knowing where to look for it could save your life.

In Australia's outback, many have died for lack of water but, as Rob shows, there is sometimes water there if you know where to look, and knowing where to look for it could save your life.

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!

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.

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.

Deane and Rob try two physical exercises involving folding arms and clasping hands. The results are surprising.

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

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.

This is a trick that you might want to try next time you are at a dinner with family or friends, but Rob advises that you should make sure they are sitting opposite you and not beside you - and don't bang on the table too hard if you are in a classy restaurant!

Deane shows how to make sound waves visible, using a cream container, a balloon
and rice grains.

If you have to bend paper or card along dotted lines, or make tear-off tickets, this simple perforating tool is invaluable and easily made, as Rob shows. All you need is an something like an old clock.