Organisms that make shells or have skeletons that are exposed to seawater, such as clams, snails and sea butterflies, could see their shells dissolve in water that is too acidic.

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They were such a hit that Taco Bell postponed a follow-up Cool Ranch flavor to early this year to make sure there was enough capacity to make the shells.

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Taco Bell, an operating company of Tricon Global Restaurants (nyse: YUM - news - people ), does not make these taco shells but licenses the Taco Bell name to Kraft, a unit of Philip Morris (nyse: MO - news - people ), for use on retail products.

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The arsenal has long been a job-provider, and it continues to make smoke grenades, artillery shells and decontamination kits.

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Exchangeable shells not only make it possible to select from a range of colors, but also to add wireless charging.

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At that point they'll reduce the need for rooms full of powder charges and the associated dangers that come along with explosive shells, but will instead need to make way for what looks to be a warehouse full of capacitors.

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Most hunters also grew up in a culture of strict regulation, where any passing game warden can ask to see your license and inspect your semiautomatic shotgun to make sure it has a plug limiting it to three shells.

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Make sure to put a bowl on the table to accommodate the shells.

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Oyster shells abound with square holes punched out of the centres, gone to make mother-of-pearl buttons.

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