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2. Electromagnetic radiation - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_radiation

   This is guaranteed since the generic wave solution is first order in both space and time, and the curl operator on one side of these equations results in first-order spatial derivatives of the wave solution, while the time-derivative on the other side of the equations, which gives the other field, is first-order in time, resulting in the same ...

3. Blockade of Germany (1939–1945) - Wikipedia

   en.wikipedia.org/wiki/Blockade_of_Germany_(1939...

   The whaler on HMS Sheffield being manned with an armed boarding party to check a neutral vessel stopped at sea, 20 Oct 1941. The Blockade of Germany (1939–1945), also known as the Economic War, involved operations carried out during World War II by the British Empire and by France in order to restrict the supplies of minerals, fuel, metals, food and textiles needed by Nazi Germany – and ...

4. Gamma ray - Wikipedia

   en.wikipedia.org/wiki/Gamma_ray

   Gamma-ray sensors are also used for measuring the fluid levels in water and oil industries. [17] Typically, these use Co-60 or Cs-137 isotopes as the radiation source. In the US, gamma ray detectors are beginning to be used as part of the Container Security Initiative (CSI). These machines are advertised to be able to scan 30 containers per hour.

5. Smartphone - Wikipedia

   en.wikipedia.org/wiki/Smartphone

   Early smartphones were marketed primarily towards the enterprise market, attempting to bridge the functionality of standalone PDA devices with support for cellular telephony, but were limited by their bulky form, short battery life, slow analog cellular networks, and the immaturity of wireless data services.

6. Fibonacci sequence - Wikipedia

   en.wikipedia.org/wiki/Fibonacci_sequence

   The lengths of the periods for various n form the so-called Pisano periods. [65] Determining a general formula for the Pisano periods is an open problem, which includes as a subproblem a special instance of the problem of finding the multiplicative order of a modular integer or of an element in a finite field.

7. Percentage - Wikipedia

   en.wikipedia.org/wiki/Percentage

   In the early 20th century, there was a dotted abbreviation form "per cent.", as opposed to "per cent". The form " per cent. " is still in use in the highly formal language found in certain documents like commercial loan agreements (particularly those subject to, or inspired by, common law), as well as in the Hansard transcripts of British ...