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• TLF-IDM025420

What is the "wisdom of a crowd"? Mathematician Lily Serna investigates a mathematical phenomenon that suggests that if you have a large enough crowd, with a broad variety of people making estimates, then the mean (average) answer of the crowd will be accurate! Find out if a crowd can guess the weight of Uluru from the ground ...

• TLF-IDM015413

Imagine an asteroid, half the size of a football field, hurtling towards Earth at a speed of 28,000 kilometres per hour! Watch this clip to find out about Asteroid 2012 DA14 and whether it poses any threat to Earth. You will also discover why mining prospectors are keen to capture asteroids such as this one. Could the next ...

• TLF-IDM015938

Did you know that the shape of an object can affect its strength? Watch as Ruben Meerman tests two columns of different shapes to see which can carry the greater load. Consider how engineers might use this information to build tall structures.

• TLF-IDM015713

Are you strong enough to pull two sheets of paper apart? What about two books with the pages intertwined? Watch this experiment performed by Ruben Meerman, the Surfing Scientist, and find out how he tests the presence of friction between pieces of paper.

• TLF-IDM015531

Discover how nanotechnology is contributing to the creation of new, improved batteries that may soon be used in all our mobile phones and portable music devices - even in cars and trams. Catalyst's Tanya Ha looks at how traditional batteries produce electricity and how their efficiency may be increased by tiny devices known ...

• TLF-IDM015797

All substances are made up of tiny particles. A change in temperature can change the way these particles behave. Watch as the Surfing Scientist demonstrates how a gas behaves when it is heated. Find out whether the balloon gets sucked or pushed into the bottle!

• TLF-IDM015922

Have you ever wondered about the steps involved in getting milk from a cow to you? This clip tells the story of milk, from the dairy farm to the supermarket. Discover where cream comes from and how milk is made safe to drink.

• TLF-IDM015755

It might sound 'un-sciencey', and have a bad smell, but red cabbage is actually very useful for testing the pH of liquids. Added to well-known liquids like lemonade or vinegar, red cabbage juice changes to 'pretty colours'. In this clip, Surfing Scientist Ruben Meerman explains the colour changes and how red cabbage juice ...

• TLF-IDM025435

Even when a maths problem seems simple – for example, the chance of two people sharing a birthday – the maths can run counter to our human intuition. Mathematician Lily Serna poses a maths problem to the Clovelly Bowling Club: how many people do you need to gather to get a 50 per cent chance of any two people in that group ...

• TLF-IDM015973

What role do fire-behaviour specialists and ecologists have in fire management? Watch this clip to find out about issues relating to fire management in Australia, in particular prescribed burning.