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How many right angles can yo...

How many right angles can you find?

Correct answers: 118

The first user who solved this task is Sanja Šabović.

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A skeleton walks ...

A skeleton walks down empty Main Street. Suddenly he sees another skeleton carrying a gravestone. "Hey, what are you doing?” the other skeleton answers "Just strolling", "Why do have the gravestone, buddy?", "Because I always want to have some ID”.

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Mendeleeff observes eclipse

In 1887, Dmitri Ivanovich Mendeleev (1834-1907) used a balloon to ascend above the cloud cover to an altitude of 11,500 feet (3.5 km) to observe an eclipse in Russia. He made the solo ascent above Klin without any prior experience. While his family was rather concerned, he paid no attention to controlling the balloon until after he had completed his observations, at which time he worked out how to land it. Mendeleev is the Russian chemist known for the ordering of the Periodic Table of the Elements. Yet, he was interested in many fields of science. He studied problems associated with Russia's natural resources, such as coal, salt, metals, and the petroleum industry. In 1876, he visited the U.S. to observe the Pennsylvania oil fields.

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