Which hair lasts the longest? Detailed answer

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Which hair lasts the longest? Detailed answer

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Which hair lasts the longest?

The shortest eyelash age is only one quarter of the year. The hair on the head and on the body lasts for four years, and then is replaced by new ones. Mustache and beard hair live the longest - up to twenty years.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

How much fuel does one passenger plane use?

A large wide-body passenger "Jumbo-Jet", which can take on board 300-400 people, consumes approximately 15000 liters of kerosene per flight hour. In its tanks, located in the cavities of the wings, it can hold up to 200000 liters of fuel.

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Supersonic biplanes are more economical than conventional aircraft 02.04.2012

Engineers from the Massachusetts Institute of Technology propose to revive the seemingly outdated biplane aircraft design. MIT experts conducted computer simulations and found that the biplane design is suitable for flying at supersonic speeds. At the same time, two wings located one above the other, reduce air resistance by half. This solves the main problem of supersonic airliners like the Tu-144 and Concorde - high fuel consumption.

The supersonic Concorde has been flying between New York and Paris for 27 years. It was in the air for only 3,5 hours, but the high cost of tickets, high fuel consumption and loud noise led to the closure of the supersonic airliner program in 2003.

Engineers at the Massachusetts Institute of Technology have tested 700 different wing configurations and believe the biplane design will help revive the appeal of high-speed air travel while saving fuel.

Computer simulations show that the biplane design significantly reduces air resistance and reduces the force of sonic boom during the flight of a supersonic aircraft. By the way, a powerful sonic boom, similar to an artillery shot, led to the fact that at one time Concorde was banned from flying at high speeds over populated regions, which further reduced the commercial attractiveness of this aircraft.

The double wing prevents the formation of powerful sound waves and at the same time reduces fuel consumption by half, which will reduce the cost of supersonic air travel.

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