For LAPD Sgt. John Spartan, the future is a perplexing setting, full of new rules, social etiquette and technology to adjust to. That includes the mystery of the three seashells, which have somehow ...
Chalk and seashells are made of the same stuff. So why is one crumbly and the other tough? If you know that seashells are made of basically the same stuff as chalk, you might have wondered why chalk ...
Chalk and seashells are made of the same thing: calcium carbonate. Shells are stronger because they have trapped proteins inside, and scientist had thought that these proteins were trapped like flies ...
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