The frozen zoo
In 1975, San Diego Zoo began placing tissue samples of rare animals in cryogenic storage for the benefit of future generations. Called the Frozen Zoo, the refrigeration system now contains the cells o...
24 Tammi 20209min
The discovery of whalesong
Whales were being hunted to extinction, when in 1967, a biologist called Dr Roger Payne realised they could sing. It changed the perception of whales and helped found the modern conservation movement....
23 Tammi 20208min
Silent Spring: A book that changed the world
Silent Spring, written by marine biologist Rachel Carson, looked at the effect that synthetic pesticides were having on the environment. Within years of its publication in 1962, the widespread use of ...
22 Tammi 20209min
How the dodo died out
A flightless bird, the dodo became extinct just decades after being discovered on the uninhabited island of Mauritius by European sailors. Because dodos couldn't fly they, and their eggs, were eaten b...
21 Tammi 20209min
The mystery of the disappearing frogs
How scientists discovered that a deadly fungus was killing off amphibians around the world. The chytrid fungus has caused the greatest loss of biodiversity in our time. Alejandra Martins spoke to biol...
20 Tammi 202014min
The killing of Osama Bin Laden
The US tracked down the al Qaeda leader to a city in northern Pakistan in May 2011. Special operations troops were sent to capture or kill bin Laden in a top secret raid in the dead of night. The Amer...
17 Tammi 20209min
The story of George Stinney Jr
How a 14-year-old boy became the youngest person to be executed in the USA during the 20th century. George Stinney Jr was sent to the electric chair in 1944. He had been tried for the murder of two yo...
16 Tammi 202010min
The woman who negotiated peace with a rebel group
In January 2014 after decades of violent struggle, a peace deal was agreed in the Philippines between a Muslim separatist organisation and the government. The deal granted largely Muslim areas of the ...
15 Tammi 202011min
