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What is the father doing now?

The mother is 21 years older than the son, and in 6 years time she will be 5 times as old as the son. What is the father doing now?

Correct answers: 18

The first user who solved this task is Sanja Šabović.

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True or false?

A little kid's in school, taking a true-false test and he's flipping a coin. At the end of the test he's flipping the coin again. The teacher says, "What are you doing?" He says, "Checking my answers."

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Heart pacemaker

In 1957, an external artificial pacemaker with internal heart electrode is first used. To maintain a patient's heartbeat rhythm an electrode was sewn to the wall of the heart and connected through the chest to an external desk-top pulse generator. A team of scientists at the University of Minnesota, led by Dr C. Walton Lillehei, made this medical advance. However, such bulky equipment was not a good long-term solution since infection often occurred along the electrode wires, and the device required no interruption in the house electricity. So Dr. Lillehei also initiated research on the use of a small portable external pacemaker for these patients with heart block. This ultimately led to the development of the billion-dollar pacemaker industry.

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