And here I mean the older, medical meaning of the word the transformation from soft tissue into the bone upon which all is built rather than the more recent derivative meaning of becoming inflexible, rigid and formulaic.

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This is why X-rays can penetrate your skin and soft tissue -- though not bone -- while sunlight mostly reflects off your skin.

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Biolase's Waterlase system uses a patented combination of water and lasers to precisely cut hard tissues (bone and teeth) and soft tissue (gums) with minimal damage to surrounding areas.

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The small, soft, edible bones of fresh sardines and smelts and canned bone-in fish like salmon are valuable sources of calcium.

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