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amandakhalaf says: I made one for my cousin for Christmas, and have made several since then. :P

Sometimes you just have to break it down to the maths of the situation. In this case, the last timelord + a london shopgirl = …

Black is the new terrifying!

Get it as a shirt, print, and more at Society6!

This chemist really knows how to control the elements!

...and I thought they only told the truth?

Get 'em here!