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Watch: Moment Jim Lovell told earth "Houston, we've had a problem" as Apollo 13 suffered a fault

Several properties of agar render it a superior jelly. Agar isn’t broken down by microbial enzymes apart from a few species (including bacteria living in marine and freshwater habitats), and it dissolves well in boiling water, making it easy to sterilize. The jelly doesn’t react with the ingredients of a broth, whose composition can be adjusted to meet the nutritional requirements of different microbes, and sets to a firm gel without the need for refrigeration.

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"To have that signal, you need that infrastructure, and that's where the planning system comes into play," Elliott says.