Inside Natures Giants - The Crocodile

Inside Nature's Giants dissects the largest animals on the planet to uncover their evolutionary secrets. Most wildlife documentaries tell you how an animal behaves, but by dissecting the animal and studying its anatomy we can we can see how an animal works. Experts in comparative anatomy, evolution and behaviour will put some of the most popular and enigmatic large animals under the knife. Veterinary scientist, Mark Evans, will interpret their findings, biologist Simon Watts tests the animals' physiology in the field and Richard Dawkins traces back the animals' place on the tree of life.

The team uncovers the crocodile's incredible jaw muscles, as biologist Simon Watt travels to Florida to test the huge strength of the massive reptile's bite: the most powerful in the animal kingdom. But while crocodiles' spiked teeth are excellent for gripping prey as they plunge into a death roll, they are useless for chewing. So how do these animals manage to digest large chunks of raw meat and bone? As the experts dissect the digestive system and inspect the stomach contents for clues, they reveal the bizarre plumbing between the heart and the stomach that might provide the key to this puzzle. And they also solve the mystery of this crocodile's premature death.

Inside Scientology: No kids allowed

Laura Dieckman was just 12 when her parents let her leave home to work full time for Scientology's religious order, the Sea Organization. At 16, she married a co-worker. At 17, she was pregnant.

She was excited to start a family, but she said Sea Org supervisors pressured her to have an abortion. She was back at work the following day.

Claire Headley joined at 16, married at 17 and was pregnant at 19. She said Sea Org supervisors threatened strenuous physical work and repeated interrogations if she didn't end her pregnancy. She, too, was back at work the next day.

Two years later she had a second abortion, this time while working for the church in Clearwater.

A St. Petersburg Times investigation found their experiences were not unique. More than a dozen women said the culture in the Sea Org pushed them or women they knew to have abortions, in many cases, abortions they did not want.

Stephen Hawking's Bedtime Stories

Everyone's got a copy of A Brief History of Time, but few have finished it. If we engage children in science young enough, will this change?

Stephen Hawking:

The book aroused a great deal of interest, although many people found it difficult to understand. But I believe everyone can, and should, have a broad picture of how the universe operates, and our place in it. This is what I have tried to convey in all my popular books.

It is extremely important to me to write for children. Children ask how things do what they do, and why. Too often they are told that these are stupid questions to ask, but this is said by grown-ups who don't know the answers and don't want to look silly by admitting they don't know. It is important that young people keep their sense of wonder and keep asking why. I'm a child myself, in the sense that I'm still looking. Children are fascinated by black holes and ask me questions. I find they soon get the idea if it is explained in simple language. And yes, it is nice to think a few of them might grow up and read A Brief History from cover to cover.

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Water CO2 calculator for UK homes goes online

A website that helps people to work out how much CO2 is being emitted to heat water in their homes has gone online.

Produced by the Energy Saving Trust (EST), it also suggests ways that users can save water and energy, as well as cutting their carbon footprint.

The Trust says CO2 from energy used to heat water in UK homes accounts for 5% of the nation's total carbon emissions.

Yet, it adds, water use is the "forgotten energy saving opportunity" by homes, businesses and policymakers.

The EST produced the calculator as an interactive, "easy to understand" tool for people to make the link between water efficiency and energy efficiency, explained Andrew Tucker, EST's water strategy manager.

Energy used in the UK water sector accounts for about 6% of the nation's total CO2 emissions, 89% of which is a result of homes and businesses heating the water.

Figures from the Trust estimate that heating water accounts for about 30% of the average household's energy bills.

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