Brain Teasers User Profile

Radmila Gavrilov

See full ranking list
short ranking list
168. Daniela Jakubovski 19
169. Kathy Wu 18
170. Radmila Gavrilov 18
171. Bratislav Rančić 18
172. Lynette Fairhurst 18
last 3 solved tasks
What number should fill in the blank? (8, 43, 11, 41, ?, 39, 17)
What will be the missing number? (9, 19, 40, ?, 170)
If 87+92=18, 57+83=13, 12+61=4 then 62+31=?

Kurt Alder

Died 20 Jun 1958 at age 55 (born 10 Jul 1902).German chemist was the corecipient (with Otto Diels) of the Nobel Prize for Chemistry in 1950 for their development of the Diels-Alder reaction (1928), or diene synthesis, a widely used method of synthesizing cyclic organic compounds. In this type of reaction, a compound containing two double bonds separated by a single bond (i.e. a conjugated diene) adds to a suitable compound containing one double bond (dienophile) to give a ring compound. In the dienophile, the double bond must have a carbonyl group on each side. The reaction proceeds in the mildest conditions, is of general application, and hence of great utility in synthesis. It is used in the synthesis of natural products, such as sterols, vitamin K, cantharides, and synthetic polymers.

Upon reaching 65, old Tom deci...

Upon reaching 65, old Tom decided to retire. His wife suggested he go and do something to occupy his time, like join a club or get a hobby
Old Tom obliged and went out for a couple of hours. When he got home his wife asked about his day and he replied, "Oh, I joined a parachute club."
"What? Are you nuts? You're 65 years old and you're going to start jumping out of airplanes?"
"Yeah, look I even got a membership card."
"Old man, you need glasses! This is a membership in a Prostitute Club, not a Parachute Club!"
"Oh, great! Now what am I going to do? I signed up for 5 jumps a week!"
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.