BRAIN TEASERS

enter your answer and press button OK

Find number abc

If babcb - 5990b = a7c0 find number abc. Multiple solutions may exist.

Correct answers: 11

#brainteasers #math

Register with your Google Account and start collecting points.

Check your ranking on list.

The Jewish Boy and the Muslim Boy

David, a Jewish boy, and Ali, a Muslim boy, are having a conversation. Ali: I'm getting operated on tomorrow. David: Oh? What are they going to do? Ali: Circumcise me! David: I had that done when I was just a few days old. Ali: Did it hurt? David: I couldn't walk for a year!

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...

Dry-cell patent

In 1887, German scientist, Dr. Carl Gassner, was issued a U.S. patent (No. 373,064), the first in the U.S. for a “dry” cell. Gassner had already patented his invention in Germany (No. 37,758) on 8 Apr 1886, and also in Austria, Belgium, England, France and Hungary in the same year. The sealed zinc shell which contained all the chemicals was also the negative electrode. Later, he improved the shelf life of the battery by adding zinc chloride to the electrolyte to reduce corrosion of the zinc shell. Gassner's battery was much like the carbon-zinc, general-purpose batteries sold today. By 1896, the National Carbide Company (later Union Carbide and Eveready) produced the first consumer dry cell battery. Two years later, the company made the first D cell.«[Image: The six-inch, 1.5 volt Columbia Dry Cell marketed by NCC in 1896.]

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.