Turkey's earthquake and China's balloon

As Turkey battles against the clock to find survivors of the recent Earthquake there, we look at what triggered the magnitude 7.8 quake. Also, how modern day codebreakers have unlocked secret correspondence penned by Mary Queen of Scots from exile in the 1500s, and the overlooked threat of indoor air pollution: we worry about what we breath in on the streets but we're potentially encountering air just as bad in our own homes... Like this podcast? Please help us by supporting the Naked Scientists