BRAIN TEASERS

# What a winning combination?

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 first user who solved this task is Djordje Timotijevic.
#brainteasers #mastermind

### Lightbulb Joke Collection 54

Q: How many post-doctoral fellows does it take to change a lightbulb?
A: One, but it'll probably take three or four tries to get it right because he/she will probably give it to the technician to do.
Q: How many graduate students does it take to screw in a light bulb?
A: Only one, but it may take upwards of five years for him to get it done.
Q: How many graduate students does it take to screw in a light bulb?
A: It all depends on the size of the grant.
Q: How many graduate students does it take to screw in a light bulb?
A: Two and a professor to take credit.
Q: How many graduate students does it take to screw in a light bulb?
A: 1/100. A graduate student needs to change 100 lightbulbs a day.
Q: Do you know how many musicians it takes to change a light bulb?
A: Twenty. One to hold the bulb, two to turn the ladder, and seventeen in on the guest list.
Q: Do you know how many musicians it takes to change a light bulb?
A: Five. One to screw in the light bulb and four to stand around and say, "Man, if I'd had his studio time, I could have done that."
Q: Do you know how many musicians it takes to change a light bulb?
A: 5, one to change the bulb and 4 to get in free because they know the guy who owns the socket.
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## Brain Teasers

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### Henry Edward Armstrong

Died 13 Jul 1937 at age 89 (born 6 May 1848). English organic chemist whose major research in substitution reactions of naphthalene was important to the synthetic-dye industry. In early work, he developed a method for sanitary surveys of water supplies by determining the organic impurities (sewage) content, which helped to control typhoid fever. Later, Armstrong also pioneered in organic crystallography, and the understanding of the chemical composition of camphor and related terpene compounds. He also devised a centric formula for benzene. Armstrong challenged Arrhenius's ionic theory, proposing instead that water is a complex saturated with the gas “hydrone.” He maintained that vapor pressure was a measure of the concentration of free hydrone molecules.
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