BRAIN TEASERS

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Find the right 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.

Correct answers: 23

The first user who solved this task is Djordje Timotijevic.

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Punctuality

A company owner was asked a question, 'How do you motivate your employees to be so punctual?'
He smiled & replied, 'It's simple. I have 30 employees and 29 free parking spaces.
...... One is paid parking.'

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Yoyo

In 1866, the first U.S. patent for a yoyo was issued to James L. Haven and Charles Hittrick of Cincinnati, Ohio. Although termed a “Whirligig” or a “Bandalore” in the patent title, it had the familiar construction of a yoyo with two disks “coupled together at their centers by means of a clutch.” It was also the first time rim-weighting to maintain momentum was mentioned in a patent. “It will be observed that the marginal swell ... exercises the function of a flywheel.” This patent is important since it shows the first use of patents to protect design improvements in the manufacture of a yoyo. Messrs. Haven and Hettrick were in the business of mass-producing yoyos over a half century before the better known Flores brand.«

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