Female green turtles dig into the sand on Raine Island to lay around 100 pingpong ballsized eggs each, leaving them to incubate in the warm sand, before returning to the water.
Returning to Australia, Sam does something he could never have done before - he delivers a perfect speech in front of his class on his African journey.
How do bees know where to find the best flowers to make honey How do they talk to each other David Attenborough shows that it's all down to the amazing 'waggle dance'.
Jim AlKhalili discusses the law of refraction originally developed by Ibn Sahl, but often attributed to Willebrord Snellius.
Astrophysicist Mario Livio demonstrates how the probability of a needle falling on a line, or between two lines, has an uncanny relationship to pi.
An overview of Shaolin monks and the development of Shaolin kungfu.
Michael Moore leads two injured victims of the Columbine shooting and a media pack to KMart's headquarters to deliver bags of 9mm bullets purchased at the store. A spokesperson announces the withdrawal of such ammunition from sale.
In a demonstration of filmmaking techniques, actors suit up so their performances can be digitised by CGI motion capture cameras.
What goes into the making of the things all around us, the clothes we wear, the bread we eat, the paper we write on? 'Magic of Making' takes us behind the closed doors of industry.
Astrophysicist Mario Livio demonstrates how the Fibonacci sequence is represented in nature, observing how the patterns in plants conform to the progression of numbers.
The terms proposition and opposition are defined in this clip from the documentary Up For Debate, with an introduction to the components of a debate speech.
To survive in the forest, cute tiger cubs must transform into invisible killers in three critical steps.
Cook and his crew encounter kangaroos, emus, echidnas and platypuses. All things 'New Holland' become the craze back in England as stuffed Australian animals are sent back to the homeland.
Tony Robinson tells the story of Edward Hargraves discovering gold in NSW in 1851, and the gold rush that followed.
Ray Poon visits the place where his great-grandfather worked as an indentured labourer in Queensland, and discusses the living and contractual conditions experienced by the Chinese migrants.
Alan Davies and Marcus du Sautoy visit the UK's National Physical Laboratory, where Mark Oxborrow takes them through an experiment that demonstrates how prime numbers exist in nature, and the Riemann hypothesis.
Alan Davies and Marcus du Sautoy visit a length bar interferometry unit and use a laser tracker to measure Alan's length of string.
Sam Willis sees how silk cocoons are processed into fabric in a modern Chinese factory, and discusses the textile's importance in trade.
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