Fergus Nicoll travels through Indian Prime Minister Modi's home constituency of Varanasi
Why plastic ends up there and how to stop it
What Silicon Valley learned from the American football coach Bill Campbell
How can educators ensure that every child in the world has access to a decent school?
Can a burger help save the planet?
India's bid to capture a slice of global shipping
Should governments spend more money?
Could a new scheme alleviate the crippling cost of university fees for young Americans?
Was the 2016 NotPetya attack a portend of devastating cyber-wars in the future?
With the sea level rising, will the world's coastal cities find themselves underwater?