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Want facts and want them fast? Our Maths in a minute series explores key mathematical concepts in just a few words.
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I heard of micro-morts during David's appearance, if you can 'appear', on the radio. It's such a great concept I bored folks with it all day. The sums are easy too. To answer the last correspondent; there are 117 deaths per billion plane journeys (http://en.wikipedia.org/wiki/Aviation_safety#Statistics) = 0.12 micro morts, and 40 deaths per billion car journeys = 0.04 micromorts. We have to assume that the car journey to the airport is average in length and so is the flight.
The airlines of course like to talk about deaths per kilometer travelled, which, given the vast distance aplane can go, look far more favourable!