Science and Measurement
- Hahnium, an element now called Dubnium
- Hartree, an atomic unit of energy
- Hectare (ha), a unit of area
- Hectoampere, a unit of electric current
- Hemagglutinin (influenza) (HA), an antigenic glycoprotein from Influenza viruses
- Hemagglutination assay, a measurement of viruses or bacteria
- Hyaluronan, a carbohydrate structure
- Hydroxylapatite, a mineral
- High availability
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“For us necessity is not as of old an image without us, with whom we can do warfare; it is a magic web woven through and through us, like that magnetic system of which modern science speaks, penetrating us with a network subtler than our subtlest nerves, yet bearing in it the central forces of the world.”
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