BRAIN TEASERS
Brain Teasers User Profile

Khoi Nguyen

rank
198
points
17
See full ranking list
short ranking list
196. Art Dexter Antipado 18
197. Ilan Amity 17
198. Khoi Nguyen 17
199. Taylor Hysmith 17
200. Saeed Haj 17
last 3 solved tasks
Tricky math! Can you solve this? If 11+11=4 and 12+12=9 Then 13+13=?
MATH PUZZLE: Can you replace the question mark with a number?
MATH PUZZLE: Can you replace the question mark with a number?

Xerography

In 1938, xerography was demonstrated by Chester F. Carlson. With his assistant, Otto Kornei, Carlson used a sulphur coating on a zinc plate, vigorously rubbed with a handkerchief to apply an electrostatic charge. A glass slide was prepared using India ink to write "10-22-38 ASTORIA," then laid on the sulphur surface in a darkened room. After illuminating them with a bright incandescent lamp for a few seconds, the slide was removed. When lycopodium powder was sprinkled on the sulphur surface and blown off, there remained a near-perfect image of the writing. Permanent copies were made by transferring the powder images to wax paper and heating the sheets to melt the wax. Xerox is a term coming from "xerography" which means dry writing and is a trademark.

Three women: one engaged, one...

Three women: one engaged, one married and one a mistress, are chatting about their relationships and decided they needed to spice up their love lives. All three agreed to wear black leather bras, stiletto heels and a mask over their eyes that evening with their respective lovers.
After a few days they meet up for lunch and compared notes.
The engaged woman: "The other night when my boyfriend came over he found me with a black leather bodice, tall stilettos and a mask. He saw me and said, 'You are the woman of my life. I love you.' Then we made love all night long."
The mistress: "Me too! The other night I met my lover at his office and I was wearing the leather bodice, heels, mask over my eyes and a raincoat. When I opened the raincoat he didn't say a word, but we had wild sex all night."
The married woman: "I sent the kids to stay at my mother's house for the night when my husband came home I was wearing the leather bodice, black stockings, stilettos and a mask over my eyes. As soon as he came in the door and saw me he said, 'What's for dinner, Batman?'"
Jokes of the day - Daily updated jokes. New jokes every day.
Follow Brain Teasers on social networks
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.