BRAIN TEASERS
Brain Teasers User Profile

hung nguyen sy

rank
47
points
193
See full ranking list
short ranking list
45. Dejan Radovanović 202
46. ভাস্কৰ জ্যোতি 196
47. hung nguyen sy 193
48. Alyssa Wu 192
49. Fuad Khalil Ibraheem 190
last 3 solved tasks
MATH PUZZLE: Can you replace the question mark with a number?
The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.

Giovanni Amici

Born 25 Mar 1786; died 10 Apr 1868 at age 82.Giovanni Battista Amici was an Italian physicist, microscopist, astronomer and optical instrument designer who is best known for his invention of the achromatic lens. He also introduced the Amici-Bertrand lens, a lens for the inspection of an objective's rear focal plane. The lens system he designed for a new type of microscope in 1837 improved the magnification, capable of up to 6000 times. In 1840, he also introduced an immersion system for microscopes; the lowermost lens was immersed in a drop of oil to reduce improve clarity. He improved the design of mirrors used in reflecting telescopes. As a biologist, he investigated the sexual function of flowers, in particular he clarified the mechanism of the pollination of orchids.«[DSD gives death year 1868. EB gives death year 1863.]

The Sentence

A schoolteacher asked her primary six class to construct sentences with the words: defeat, detail, defense.

There was a pause before a pupil raised his hand and said he could make a sentence with them; "The cow jumped over defense and detail went over defeat."
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.