BRAIN TEASERS

For getting in a building, you need to give the correct password to the watchman. When the watchman says 6, the password is 3. When he says 12, the password is 6. But when he says 8, the password is NOT 4. What is the password when he says 8?
The first user who solved this task is Djordje Timotijevic.
#brainteasers #riddles

### Math Teacher

Math Teacher: "If I have 5 bottles in one hand and 6 in the other hand, what do I have?"
Student: "A drinking problem."
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## Brain Teasers

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### Francesco Maria Grimaldi

Born 2 Apr 1618; died 28 Dec 1663 at age 45.Italian physicist and mathematician who studied the diffraction of light. He observed the image on a screen in a darkened room of a tiny beam of sunlight after it passed pass through a fine screen (or a slit, edge of a screen, wire, hair, fabric or bird feather). The image had iridescent fringes, and deviated from a normal geometrical shadow. He coined the name diffraction for this change of trajectory of the light passing near opaque objects (though, more specifically, it may have been interferences with two close sources that he observed). This provided evidence for later physicists to support the wave theory of light. With Riccioli, he investigated the object in free fall (1640-50), and found that distance of fall was proportional to the square of the time taken.«
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