The main ingredient is a small amount of mercury, which is placed inside a strong yet light container made of a composite material such as Kevlar.

ECONOMIST: Mirror, mirror

Then there is a third class, known as similares, medicines which, drugmakers pledge, have the right amount of active ingredient but aren't tested in the body.

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So while the additional dissolved iron triggered an earlier-than-usual phytoplankton bloom, as the metal triggered growth in a greater number of phytoplankton cells, the bloom was only 15-20% larger than normal because the growth was limited by the amount of available nitrogen, another vital ingredient required for the organisms to develop.

BBC: Iceland volcano ash cloud triggers plankton bloom

The result is a constantly shifting estimation of ingredient amounts and timed processes, supposedly resulting in the exact amount of food I desire, ready at the moment I wish to eat it.

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