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Black-nosed Butterflyfish Johnrandallia nigrirostris
2012-05-22 10:48:22

The Black-nosed Butterflyfish (Johnrandallia nigrirostris), also known as the Barberfish, the Barber, or Butterfly Barber, is a species of fish in the Chaetodontidae family of butterfly fishes. This fish is sometimes referred to as a cleaner fish. It is the only member of its genus and named after the ichthyologist John E. Randall. It is found in the East Pacific Ocean from the Gulf of...

Word of the Day
tesla
  • The unit of magnetic flux density in the International System of Units, equal to the magnitude of the magnetic field vector necessary to produce a force of one newton on a charge of one coulomb moving perpendicular to the direction of the magnetic field vector with a velocity of one meter per second. It is equivalent to one weber per square meter.
This word is named for Nikola Tesla, the inventor, engineer, and futurist.