Yesterday Paul O’Donoghue on the Pat Kenny show, was speaking to teachers and pupils complaining of ‘freezing’ classrooms. But what is the science behind getting really cold and can you work in these conditions long term, is it bad for you or does it strengthen your immune system and make you hardy? Henry McKean has been speaking to workers who normally work in fridge like conditions. With Dublin Wicklow Mountain Rescue Team and Leo Ryan from innate-strength.com