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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.

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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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The horizontal fraction bar was introduced by the Arabs.

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In 1864, the first barbiturate (barbituric acid) was synthesized.

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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

A comparison of the proteomes in human liver and skeletal muscle cells A comparison of the proteomes in human liver and skeletal muscle cells
The birth weight of human infants is tightly constrained by natural selection. The birth weight of human infants is tightly constrained by natural selection.
The difference between a human and an ape. The difference between a human and an ape.
The Cultural Landscape: An Introduction to Human Geography (11) The Cultural Landscape: An Introduction to Human Geography (11)
Some threatened and endangered species Some threatened and endangered species
Human embryo at successive stages of development (not to scale). Human embryo at successive stages of development (not to scale).
Video: Mitochondrial Structure & ETC Protein Complexes (Protein Complexes and Electron Transport)

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