Why does scribbling on paper get a pen to work? Why can't mules reproduce? How soon will they be able to lessen the effects of Multiple Sclerosis? When you burn wood, where does the weight go? How do touch screens work? Plus, why feeling your age might...

How do you get an old pen to work?

Chris Smith is a medical doctor and scientist, employed as a specialist registrar and clinical lecturer in virology at Cambridge University. He is also the founder and driving force behind The Naked Scientist.

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How do you get an old pen to work?

How do you get an old pen to work?