full episodes downton abbey

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?

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.

Pop-up books are fascinating but very hard to make. Rob's animated face card is much easier, but still a great deal of fun to design and do.

How can you cut this odd-shaped batch of toffee into two equal halves? As Rob reveals, once you think about it the right way, the answer is surprisingly simple.

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.

Deane provides a match stick puzzle to try at home.

Deane and Rob estimate the number of nails in a wooden house and the number of hairs on the head.

Bone is one of nature's most impressive materials; hard and strong but tough and flexible and, as Rob explains, the architecture of the hidden core of bones reveals a lot about the animals from which they come.

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 sets up three problems regarding sliding coins colliding with each other on a tabletop.

Rob shows how a simple drinking straw, cut and bent, makes a neat little whistle.

Deane shows how to make a miniature cardboard duck shooting gallery. It is made from matchboxes, rubber bands, ice cream sticks, matches, cardboard and marking pens.