Acid rain

During the Vietnam War, North Vietnamese VietCong guerrillas built a vast network of tunnels in the south of the country as part of the insurgency against the South Vietnamese government and their American allies. The tunnel network was a key base and shelter for the North Vietna ...  Show more

In the early hours of 30 April, 1943, the most audacious hoax of World War Two has just got underway. Its code-name - Operation Mincemeat.The body of a British naval officer, Major William Martin, has been washed up on a Spanish beach. The dead man is carrying top-secret papers r ...  Show more

As the oceans absorb manmade carbon emissions a chemical reaction takes place which is making sea water more acidic. This subtle shift in pH level is having a profound effect on the sea animals which use calcium carbonate to form their shells and skeletons and Marine Biologists a ...  Show more

Throughout human history, cities have grappled with how to keep excrement separate from drinking water. In the Middle Ages, gong farmers excavated human waste from city dwellers and took it to the countryside to be used as fertilizer. In the 19th century, cities grew so big, this ...  Show more

An eyewitness account of the overthrow of Ghana's famous independence leader. And we examine Nkrumah's legacy with Prof. Gareth Austin from Cambridge University. Plus the story of a heroic African WW2 airman, the scientists who alerted the world to the threat of acid rain, a N ...

Tree mortality in tropical moist forests in Australia has been increasing since the mid 1980s. The death rate of trees appears to have doubled over that time period. According to an international team of researchers, the primary cause is drier air in these forests, the consequenc ...  Show more