The physics of squeaking sneakers

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which seems pretty wasteful. And it may be that in your program, the

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In some cases, alternative gelling agents might provide faster results. Researchers observed that bacterial cellulose and another bacterial polysaccharide, Eladium, allow a 50 percent increased growth rate for various bacteria and yeasts (as compared to their growth on agar), including higher biomass yields or faster detectable biofilm formation. However, both substances are still not as cheap and readily available as agar.

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Welcome to your guide to Pips, the latest game in the New York Times catalogue.