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A tree in Kew Gardens survived the storm of 1987 and revolutionised gardening.
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The overhaul of India's rape laws followed the fatal gang rape of a student in Delhi.
The Way Ahead group was set up in the 1990s to make Britain’s monarchy more relevant.
Since 1975, San Diego Zoo has been deep-freezing cell samples from rare species.
In the 1960s whales were being hunted to extinction.
'Silent Spring' examined the effect of pesticides on the environment
A flightless bird, the dodo was extinct just decades after being discovered by Europeans
How scientists discovered that a deadly fungus was killing off amphibians.
The US tracked down the al-Qaeda leader to a town in northern Pakistan in 2011
How a 14-year-old boy became the youngest person executed in the USA in the 20th century