Normally, you don't want to lose all of your blood, but in this case, surgeons had to remove all of a patients blood in a daring operation. Subscribe: [ Ссылка ]

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Trust Me I'm A Doctor - This series promises to get the answers to everything you ever wanted to know about colds, sleep, stress, headaches, hearts, sun-creams, exercise and much more.

Here at BBC Earth Science we answer all your curious questions about science in the world around you. If there’s a question you have that we haven’t yet answered or an experiment you’d like us to try let us know in the comments on any of our videos and it could be answered by one of our Earth Science experts.

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