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The 'element of life' also makes the air that we breathe a perilous and costly atmosphere in which to operate. Prof Andrea Sella of University College London provides presenter Justin Rowlatt with a characteristically striking argument for why oxygen is so 鈥渋ncredibly dangerous鈥� - and how its advent turned Planet Earth into a snowball. Pawanexh Kohli, in charge of India鈥檚 national cold chain strategy, explains over a cup of chai why the oxygen needs of fresh vegetables and fresh meat are very different. Physics polymath Baldev Raj unpicks the mystery of Delhi鈥檚 1,600-year-old iron pillar, and explains just how damaging rust and corrosion can be. And former 鈥渟moke-jumper鈥� Frankie Romero explains the mesmerising attraction of wildfires, and why stamping them out is not always a good idea.