Scientists have made synthetic 'sea shells' from a mixture of chalk and polystyrene cups -- and produced a tough new material that could make our homes and offices more durable. Scientists have made ...

Chalk is a fine-textured form of limestone. It is composed of several tiny fragments of the calcite shells or skeletons of ...

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 ...

Dustless chalk has been around for a while, but Nihon Rikagaku’s developed a new kind of chalk made from crushed-up scallop shells which reduces dust but manages to maximize the intensity of the ...

Study shows how calcium carbonate forms composites to make strong materials such as in shells and pearls RICHLAND, Wash. -- Seashells and lobster claws are hard to break, but chalk is soft enough to ...

I LOOKED forward with great interest to the conclusion of Messrs. Murray and Renard's “Origin and Distribution of Deep-Sea Deposits,” hoping that some useful comparisons would have been made between ...