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2. Microwave - Wikipedia

   en.wikipedia.org/wiki/Microwave

   Microwave. A telecommunications tower with a variety of dish antennas for microwave relay links on Frazier Peak, Ventura County, California. The apertures of the dishes are covered by plastic sheets (radomes) to keep out moisture. Microwave is a form of electromagnetic radiation with wavelengths shorter than other radio waves (as originally ...

3. Cosmic microwave background - Wikipedia

   en.wikipedia.org/wiki/Cosmic_microwave_background

   The cosmic microwave background (CMB, CMBR), or relic radiation, is microwave radiation that fills all space in the observable universe. With a standard optical telescope, the background space between stars and galaxies is almost completely dark. However, a sufficiently sensitive radio telescope detects a faint background glow that is almost ...

4. 1.1.1-Propellane - Wikipedia

   en.wikipedia.org/wiki/1.1.1-Propellane

   The molecular structure consists of three rings of three carbon atoms each, sharing one C–C bond. [1.1.1]Propellane is a highly strained molecule. The bonds of the two central carbon atoms have an inverted tetrahedral geometry, and the length of the central bond is 160 pm. The strength of that bond is disputed; estimates vary from 59–65 ...

5. Black Friday (shopping) - Wikipedia

   en.wikipedia.org/wiki/Black_Friday_(shopping)

   Black Friday is the Friday after Thanksgiving in the United States. It traditionally marks the start of the Christmas shopping season in the United States. Many stores offer highly promoted sales at discounted prices and often open early, sometimes as early as midnight [2] or even on Thanksgiving.

6. Microwave imaging - Wikipedia

   en.wikipedia.org/wiki/Microwave_imaging

   Microwave imaging is a science which has been evolved from older detecting/locating techniques (e.g., radar) in order to evaluate hidden or embedded objects in a structure (or media) using electromagnetic (EM) waves in microwave regime (i.e., ~300 MHz-300 GHz). [1] Engineering and application oriented microwave imaging for non-destructive ...

7. 1.1-inch/75-caliber gun - Wikipedia

   en.wikipedia.org/wiki/1.1-inch/75-caliber_gun

   The 1.1"/75 caliber gun was an American anti-aircraft weapon of World War II, used by the United States Navy. [3] The name means that it had a bore diameter of 1.1 in (28 mm) and barrel caliber of 75 (1.1 inches × 75 = 82.5 in (2.1 m)). The gun was designed to replace the M2 Browning and four barrels were required to duplicate the rate of fire ...