BRAIN TEASERS

enter your answer and press button OK

Calculate the number 9070

NUMBERMANIA: Calculate the number 9070 using numbers [6, 3, 5, 9, 67, 770] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 27

The first user who solved this task is Donya Sayah30.

#brainteasers #math #numbermania

Register with your Google Account and start collecting points.

Check your ranking on list.

STEVE JOBS FUNERAL

STEVE JOBS FUNERAL - They put him in this really expensive coffin, then they paid extra for a plastic case to protect it from scratches.

@realjeffreyross on Steve Jobs's funeral. http://on.cc.com/1E45WyW

Jokes of the day - Daily updated jokes. New jokes every day.

Follow Brain Teasers on social networks

Brain Teasers

puzzles, riddles, mathematical problems, mastermind, cinemania...

Tungsten filaments

In 1913, Dr William David Coolidge patented (U.S. No. 1,082,933) a method for making ductile tunsten for the purpose of making filaments for electric lamps. When Coolidge joined the General Electric Research Laboratory (1905), he was given the task of replacing the fragile carbon filaments in electric light bulbs with tungsten filaments, although tungsten was difficult to work. He developed a way to superheat the metal tunsten in order to draw it out into the fine threads used for lamp filaments. Coolidge then improved the X-ray tube by using a heated tungsten filament cathode in vacuum producing electrons, instead of residual gas molecules in the tube. This permitted higher operating voltages, higher energy X rays and the treatment of deeper-seated tumors.

This site uses cookies to store information on your computer. Some are essential to help the site properly. Others give us insight into how the site is used and help us to optimize the user experience. See our privacy policy.