<p>Picture this. You swallow a little pill, wait until it irritates your intestines enough to expel its contents and then hunt through the expelled excrement to retrieve the pill. Why? So you can use it next time to get rid of the bad humours in your body that are making you sick. How can a pill survive passage through the digestive tract? It can, if it is made of metal, in this case, antimony. Now, don’t go asking the pharmacist for antimony pills.</p>
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