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  2. Atomic bombings of Hiroshima and Nagasaki - Wikipedia

    en.wikipedia.org/wiki/Atomic_bombings_of...

    On 6 and 9 August 1945, the United States detonated two atomic bombs over the Japanese cities of Hiroshima and Nagasaki. The bombings killed between 129,000 and 226,000 people, most of whom were civilians, and remain the only use of nuclear weapons in an armed conflict. Japan surrendered to the Allies on 15 August, six days after the bombing of ...

  3. IP code - Wikipedia

    en.wikipedia.org/wiki/IP_Code

    The IP code or ingress protection code indicates how well a device is protected against water and dust. It is defined by the International Electrotechnical Commission (IEC) under the international standard IEC 60529 [1] which classifies and provides a guideline to the degree of protection provided by mechanical casings and electrical enclosures ...

  4. Speed of sound - Wikipedia

    en.wikipedia.org/wiki/Speed_of_sound

    The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. At 20 °C (68 °F), the speed of sound in air is about 343 m/s (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn ), or 1 km in 2.91 s or one mile in 4.69 s. It depends strongly on temperature as well as the medium through which a ...

  5. Elizabeth II - Wikipedia

    en.wikipedia.org/wiki/Elizabeth_II

    Elizabeth II. Elizabeth II (Elizabeth Alexandra Mary; 21 April 1926 – 8 September 2022) was Queen of the United Kingdom and other Commonwealth realms from 6 February 1952 until her death in 2022. She was queen regnant of 32 sovereign states over the course of her lifetime and remained the monarch of 15 realms by the time of her death.

  6. List of United States cities by population - Wikipedia

    en.wikipedia.org/wiki/List_of_United_States...

    50 states and Washington, D.C. This table lists the 336 incorporated places in the United States, excluding the U.S. territories, with a population of at least 100,000 as of July 1, 2023, as estimated by the U.S. Census Bureau. Five states have no cities with populations exceeding 100,000. They are: Delaware, Maine, Vermont, West Virginia, and ...

  7. Attack on Pearl Harbor - Wikipedia

    en.wikipedia.org/wiki/Attack_on_Pearl_Harbor

    The attack on Pearl Harbor [nb 3] was a surprise military strike by the Imperial Japanese Navy Air Service on the American naval base at Pearl Harbor in Honolulu, Hawaii, in the United States, just before 8:00 a.m. (local time) on Sunday, December 7, 1941. At the time, the United States was a neutral country in the World War II conflict.

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