courtesy of Alex Imas
Before agar, microbiologists had experimented with other foodstuffs as microbial media. They turned to substances rich in the starches, proteins, sugars, fats, and minerals that organisms need for growth, testing with broths, bread, potatoes, polenta, egg whites, coagulated blood serums, and gelatine. However, none worked particularly well: all were easily broken down by heat and microbial enzymes, and their surface, once colonized, became mushy and unsuitable for isolating microbes.
，这一点在新收录的资料中也有详细论述
The Light Gathering Power is defined as: $$LGP = \frac{D^2}{d^2}$$
Would like to point out how Go is rather the exception than the norm with regards to including UUID support in its standard library.