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1. Light producing chemicals: how to make bioluminescence
   The most remarkable luciferin in terms of its distribution is known as coelenterazine. This nitrogen-ring based molecule is found in nine separate groups, ranging from radiolarians to fish.

2. Bioluminescence
   Flying through the air on a summer's evening or sparkling in the ocean you may see magical flashes of light that signal some of nature's most enchanting creatures, those that are bioluminescent.

3. Tetrodotoxin
   Not many foods served in a restaurant can kill you, but pufferfish is the exception. Tetrodotoxin, the toxin responsible for such culinary fatalities, reveals a fascinating story of convergent evolution...

4. Zinc in teeth
   On land, we find the employment of zinc to reinforce feeding structures in the fangs of spiders, and also in a variety of insect groups.