Imagine a substance so powerful that it could blow you to bits or save your life depending on how you used it. Well imagine no more: such a substance exists and you've probably heard of it.

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Sources:
http://onlinelibrary.wiley.com/doi/10.1046/j.1440-1681.2000.03240.x/abstract
https://www.brainpickings.org/2013/09/17/molly-oldfield-secret-museum-alfred-nobel-will/
http://antoine.frostburg.edu/chem/senese/101/redox/faq/nitroglycerin.shtml
http://www.bbc.co.uk/history/historic_figures/nobel_alfred.shtml
http://io9.gizmodo.com/5677950/the-explosive-that-became-a-heart-medicine
http://www.mayoclinic.org/drugs-supplements/nitroglycerin-oral-route-sublingual-route/description/drg-20072863
http://www.straightdope.com/columns/read/2506/how-does-nitroglycerin-stop-heart-attacks
http://npic.orst.edu/factsheets/degen.html