Intermediate Word:  aliphatic (a) tending to slip out of alignment  (b) bizarre  (c) ferruginous  (d)  with carbon molecules in an unbranched chain
Difficult Word: - redigote  (a) slip coating used in firing pottery  (b) man's long, double-breasted topcoat  (c) burrowing African mammal  (d) twin-hulled pirogue

Wild gorillas seen to use tools  - BBC  Left:  "What's fascinating is the similarity between what these creatures have done and what we do."  Gorillas have been seen for the first time using simple tools to perform tasks in the wild, researchers say. Scientists observed gorillas in a remote Congolese forest using sticks to test the depth of muddy water and to cross swampy areas. Wild chimps and orangutans also use tools, suggesting that the origins of tool use may predate the evolutionary split between apes and humans. Chimpanzees use stone tools to process food, and their close relatives bonobos will use the mashed ends of sticks to soak up liquids.   
'A billion will die' from smoking  - BBC   A billion people will die from tobacco-related diseases such as cancer this century unless more are encouraged to quit, a UK expert warns. In the last century the death toll was about 100m, including 7m in Britain. Many nations are cutting smoking, but rates are increasing in countries such as India and China. Each year, about 30m people take up smoking around the world, Professor Peto said. In China, a third of young men are dying from smoking-related diseases already. Hungary is now the country with the worst tobacco death rate in the world. Professors Boyle said more effort was needed to help smokers quit.

Bats a 'likely source' of Sars  - BBC  The likely source of the respiratory disease Sars is the horseshoe bat, a new study suggests. Researchers found a virus closely related to the Sars coronavirus in bats from three regions of China. Writing in the journal Science, they say the virus may have needed to infect another animal such as the civet before it could transmit to humans. "The virus we found is 92% similar to the human Sars virus," said Zhengli Shi, from the Institute of Zoology at the Chinese Academy of Sciences, Beijing. "These bats have a wide distribution in Europe and Asia," said Peter Daszak, "and what we need to know urgently, is the distribution of the Sars-like virus in these bats.  

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