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  2. Hydrogen - Wikipedia

    en.wikipedia.org/wiki/Hydrogen

    Hydrogen poses a number of hazards to human safety, from potential detonations and fires when mixed with air to being an asphyxiant in its pure, oxygen-free form. [165] Also, liquid hydrogen is a cryogen and presents dangers (such as frostbite ) associated with very cold liquids. [ 166 ]

  3. United States congressional apportionment - Wikipedia

    en.wikipedia.org/wiki/United_States...

    Article One, Section 2, Clause 3 of the United States Constitution initially provided: . Representatives and direct Taxes shall be apportioned among the several States which may be included within this Union, according to their respective Numbers, which shall be determined by adding to the whole Number of free Persons, including those bound to Service for a Term of Years, and excluding Indians ...

  4. Computer mouse - Wikipedia

    en.wikipedia.org/wiki/Computer_mouse

    SpaceBall 4000 FLX has a maximum deflection of approximately 3 mm (0.12 in) at a maximum force of approximately 10N, that is, a stiffness of approximately 33 N/cm (19 lb f /in). SpaceMouse has a maximum deflection of 1.5 mm (0.059 in) at a maximum force of 4.4 N (0.99 lb f ), that is, a stiffness of approximately 30 N/cm (17 lb f /in).