It is difficult to know exactly when the shift from gelatine to agar occurred. As often happens for scientific breakthroughs, agar was likely adopted incrementally alongside the use of other growth media. In 1913, for example, the first diagnosis of Serratia marcescens as a human pathogen was made by growing it on agar as well as on potatoes.
The original contract between the NHS and Crawford is publicly available, but has been heavily redacted
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Part of a Soviet-era spacecraft is likely to have re-entered the Earth's atmosphere after being stuck in orbit for more than half a century, the European Space Agency said.
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