If you want to mess with your head, without putting illicit substances in your bloodstream (or while, we won't judge you), there are few things better than an optical illusion. A pseudoscope lets you view the world through the lens of Escher; or rather, in simpler terms, it swaps what you see with your left eye with what you see with your right eye, bringing the background forward, and pushing the foreground back. It will mess with your perception, man!
You can make one from a kit, as above, or collect the parts and follow a tutorial to make one, yourself.
Ever wanted to see an atom split? Using a spinthariscope, you can. We don't think you'd be able to get one of these into Australia, but if you figure out a way, let us know. Invented in 1903 by Sir William Crookes, they contain a tiny amount of radioactive material — in the case of this one from United Nuclear, that material is Thorium, which is naturally radioactive and is permanently sealed within the device.
As the Thorium decays, it expels exploding particles (they can't penetrate the casing, don't worry), which emit a tiny flash of light when they come into contact with a sheet of Zinc Sulfide, directly above the Thorium. You can peer through the lens that is affixed to the top, to see teeny tiny nuclear explosions in action. Cooooool.
You can read more about the history of the spinthariscope here.
Curiosity is using a spectroscope up on Mars to analyse the chemical elements it finds, but you can make a simple one using materials you have around the home. A spectroscope is an instrument that is used for examining light waves; more specifically, which parts of white light are absorbed by elements. Each element has its own spectral "fingerprint" — scientists study these fingerprints to determine the make-up of stones, gases and other elements.
The spectroscope project linked above uses a box and an old CD, but you can find proper pocket spectroscopes, such as the kind used by gemologists, online.
Field's metal — or Gallium — is an element with a very low melting-point — 29.77 °C, to be a little more exact. That is below the average human body temperature, so you can melt it just by holding it in your hand. It doesn't occur in nature, but it can be found in trace amounts in bauxite and zinc, and is also a by-product from the production of aluminium and zinc.
We're not really sure what you can do with it, but it seems like a really cool thing just to have and play with — and we particularly like the trick of handing a guest a spoon cast made from Gallium to use in a hot drink.
Here's another one that might be a bit difficult to get in Australia, but it will make your campfire look real snazzy while you're grilling a snag. Each of the five chemicals changes the colour of flames.
Before you grow all disconsolate over its absence in Australia, you may be able to get separate chemicals, at least. Chemicals that will change the colour of your flames, as directed on About.com (which also gives directions on how to use the chemicals), are:
Strontium Chloride or Strontium Nitrate
Sodium Chloride (table salt) or Sodium Carbonate
Copper Sulfate or Boric Acid
3 parts Potassium Sulfate 1 part Potassium Nitrate (saltpetre)
This one might be suited more for those days when you need to get your super-spy on, but wouldn't it be awesome to arrange a romantic date where you give your partner UV clues to meet you somewhere, adding an astral telescope for a night of stargazing? You can have that one; that one's on us.
Gyroscopes — which we mostly discuss in relation to the motion-detection capabilities of smartphones and other gadgets — are devices that measure orientation. After developments over around 90 years, the gyroscope, as we more or less know it today, was developed by mathematicians, and has remained pretty much unchanged since then for larger applications (smaller devices, such as the iPhone, use a Micro-Electro-Mechanical chip). They're also pretty fun to watch — seeming to defy gravity as they, to quote mathematician Lewis Carroll out of context, "gyre and gimble". Read about how they work on How Stuff Works.
Orreries are absolutely gorgeous things. Remember in The Dark Crystal, Aughra's observatory, where she had a working model of her solar system? That's what an orrery is. It shows the relative positions of the Sun, the planets and, in more complicated models, other bodies in the solar system (although, not to scale, for obvious reasons), on overlapping rotating arms of varying length. They mostly operate on clockwork — you wind them up and watch how the planets move across the sky in relation to each other.
They can be a little pricey, but are things of beauty and wonder, indeed. If you can't afford to buy one outright, though, you can always have a crack at this kit from Grand Illusions.
Remember this one from activity books when you were a kid? It's basically a way to make an animated image. The slits in the "crown" mean that when you spin the zoetrope, you can see inside, kind of like quickly walking past fence palings.
The lower strip is where you can draw your animation images in a series of incremental movements, like you would in a flip-book. When the zoetrope spins, it goes too fast for you to pick out individual images, creating a very simple animation.
Maybe it's not particularly mad-science-y, but it's fun.
If you're feeling a spark of something special right now, that's probably because of the Wimshurst machine in the picture above — a device that generates static electricity. You might be more familiar with the Van de Graaff generator from high school science — but the added bonus of this particular Wimshurst machine is that you can make it yourself, using easy-to-find components. So not only do you get the benefit of a really cool gizmo, you can satisfy the hobbyist in yourself with a DIY project. Win.
We've all heard about telescopes for viewing far-away stars, but what about one for getting up close and personal — and without burning your eyes? The Sunspotter is a folded-Keplerian telescope that lets you view a three-inch image of the sun on a white screen to view solar activity, such as storms and spots. It'll cost you a few pennies, but watching the Transit of Venus live? Priceless.