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  2. Advisory circular - Wikipedia

    en.wikipedia.org/wiki/Advisory_circular

    By writing advisory circulars, the FAA can provide guidance for compliance with airworthiness regulations, pilot certifications, operational standards, training standards, and any other rules within the 14 CFR Aeronautics and Space title, aka 14 CRF or FARs. The FAA also uses advisory circulars to officially recognize "acceptable means, but not ...

  3. Hamas - Wikipedia

    en.wikipedia.org/wiki/Hamas

    Hamas was established in 1987, and allegedly has its origins in Egypt's Muslim Brotherhood movement, which had been active in the Gaza Strip since the 1950s and gained influence through a network of mosques and various charitable and social organizations.

  4. Ammonia - Wikipedia

    en.wikipedia.org/wiki/Ammonia

    Ammonia has sometimes been used to fill balloons as a lifting gas. Because of its relatively high boiling point (compared to helium and hydrogen), ammonia could potentially be refrigerated and liquefied aboard an airship to reduce lift and add ballast (and returned to a gas to add lift and reduce ballast).

  5. Democracy - Wikipedia

    en.wikipedia.org/wiki/Democracy

    One form of democracy is direct democracy, in which all eligible citizens have active participation in the political decision making, for example voting on policy initiatives directly. [189] In most modern democracies, the whole body of eligible citizens remain the sovereign power but political power is exercised indirectly through elected ...