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2. Control rod - Wikipedia

   en.wikipedia.org/wiki/Control_rod

   Control rods are used in nuclear reactors to control the rate of fission of the nuclear fuel – uranium or plutonium. Their compositions include chemical elements such as boron, cadmium, silver, hafnium, or indium, that are capable of absorbing many neutrons without themselves decaying. These elements have different neutron capture cross ...

3. Phenix Aviation Phenix - Wikipedia

   en.wikipedia.org/wiki/Phenix_Aviation_Phenix

   The Phenix Aviation Phenix (English: Phoenix) is a Spanish autogyro, under development by Phenix Aviation of Alicante. The aircraft is intended to be supplied as a complete ready-to-fly-aircraft. [1] The project was first announced at the Aero 09 show held in Friedrichshafen, Germany in 2009. The first prototype flew in 2010, with the second ...

4. Cuisenaire rods - Wikipedia

   en.wikipedia.org/wiki/Cuisenaire_rods

   Cuisenaire rods. Cuisenaire rods are mathematics learning aids for pupils that provide an interactive, hands-on [1] way to explore mathematics and learn mathematical concepts, such as the four basic arithmetical operations, working with fractions and finding divisors. [2] [3] In the early 1950s, Caleb Gattegno popularised this set of coloured ...

5. Harrington rod - Wikipedia

   en.wikipedia.org/wiki/Harrington_rod

   Harrington rod. The Harrington rod (or Harrington implant) is a stainless steel surgical device. [1] Historically, this rod was implanted along the spinal column to treat, among other conditions, a lateral or coronal-plane curvature of the spine, or scoliosis. Up to one million people had Harrington rods implanted for scoliosis between the ...

6. Rod (optical phenomenon) - Wikipedia

   en.wikipedia.org/wiki/Rod_(optical_phenomenon)

   Rod (optical phenomenon) This long-exposure photograph of moths flying around a floodlight shows an exaggerated "rod" effect. In cryptozoology and ufology, " rods " (also known as " skyfish ", " air rods ", or " solar entities ") are elongated visual artifacts appearing in photographic images and video recordings.

7. Counting rods - Wikipedia

   en.wikipedia.org/wiki/Counting_rods

   Counting rods (筭) are small bars, typically 3–14 cm (1" to 6") long, that were used by mathematicians for calculation in ancient East Asia. They are placed either horizontally or vertically to represent any integer or rational number . The written forms based on them are called rod numerals.