India is completely dependent on imports of potash, a fertiliser essential for crops.
This toxic metal is being phased out of our lives, but still keeps planes up in the air.
Hydrogen (H) - fusion
Could we finally be about to crack this source of potentially unlimited clean energy?
Why does iodine deficiency still blight children in developing countries like India?
The shiniest and showiest of metals has some surprisingly modern applications.
The poison in everything from paint and sweets, to telegraph polls and drinking water.
Platinum group (Pt, Pd, Ru, Rh, Os, Ir)
Six rare metals that clean the air but are the focus of violent conflict in South Africa.
This metal offers thousands of years of nuclear energy, but is it any safer than uranium?
Why do we value this useless metal? And does it bring out the worst in human nature?
In the final programme in the series we look at the rarest members of the periodic table.
Game On - IRL and not IRL?
A brand goes real world and the real world goes online.
RSA's Food, Farming and Countryside Commission report, the cost of food without pesticides, 100 years of wheat
Should all UK farming be putting the environment before food production?
Katherine Joy on moon rock
Lunar geologist Katherine Joy tells Jim Al-Khalili why we need to go back to the moon.
Kenya Special: A decade on
Digital Planet re-visits Kenya 10 years after the submarine broadband cable was connected
17/07/19: Rural domestic abuse, bee disease, insurance for crops, adders
Rural domestic abuse - is it the hidden curse of the countryside?