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  2. Scuba diving - Wikipedia

    en.wikipedia.org/wiki/Scuba_diving

    Recreational scuba diver The undersea kelp forest of Ana Capa off of the coast of Oxnard, California Diver looking at a shipwreck in the Caribbean Sea. Scuba diving is a mode of underwater diving whereby divers use breathing equipment that is completely independent of a surface breathing gas supply, and therefore has a limited but variable endurance. [1]

  3. Helium-3 - Wikipedia

    en.wikipedia.org/wiki/Helium-3

    Helium-3 (3 He [1] [2] see also helion) is a light, stable isotope of helium with two protons and one neutron. (In contrast, the most common isotope, helium-4, has two protons and two neutrons.)

  4. Grenade - Wikipedia

    en.wikipedia.org/wiki/Grenade

    A grenade is a small explosive weapon typically thrown by hand (also called hand grenade), but can also refer to a shell (explosive projectile) shot from the muzzle of a rifle (as a rifle grenade) or a grenade launcher.

  5. Gravitational wave - Wikipedia

    en.wikipedia.org/wiki/Gravitational_wave

    Gravitational waves transport energy as gravitational radiation, a form of radiant energy similar to electromagnetic radiation. [7] Newton's law of universal gravitation, part of classical mechanics, does not provide for their existence, instead asserting that gravity has instantaneous effect everywhere. Gravitational waves therefore stand as ...

  6. Elevator - Wikipedia

    en.wikipedia.org/wiki/Elevator

    Sometimes passenger elevators are used as a city transport along with funiculars. For example, there is a three-station underground public elevator in Yalta , Ukraine , which takes passengers from the top of a hill above the Black Sea on which hotels are perched, to a tunnel located on the beach below.

  7. Internet protocol suite - Wikipedia

    en.wikipedia.org/wiki/Internet_protocol_suite

    The TCP/IP model's transport or host-to-host layer corresponds roughly to the fourth layer in the OSI model, also called the transport layer. QUIC is rapidly emerging as an alternative transport protocol. Whilst it is technically carried via UDP packets it seeks to offer enhanced transport connectivity relative to TCP. HTTP/3 works exclusively ...