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Articles & explainers

40,619 published items in this category and its subcategories.

Why is it dark at night?
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Why is it dark at night?

Why is the night sky dark? You may think the answer is obvious because the sun goes down. However, the answer is not so.

December 18, 2018
Decode the mysterious circle in Antarctica
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Decode the mysterious circle in Antarctica

Scientists taking part in the reconnaissance flight over the Southeastern region have discovered a mysterious circular-like structure in the often flat and unspecified i…

December 18, 2018
Why can't you tickle yourself?
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Why can't you tickle yourself?

In some respects, this reflex is similar to how you hold your fists and pretend to punch yourself.

December 18, 2018
4 trendy entertainment trends
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4 trendy entertainment trends

Party mummies, collect ferns, go for a walk or hire a garden hermit are the world's top entertainment trends in the 18th and 19th centuries.

December 18, 2018
Mystery of the disease
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Mystery of the disease

More than 500 years ago in Strasbourg (France), a strange epidemic caused hundreds of people to dance together to death.

December 18, 2018
When is the smartest person?
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When is the smartest person?

Einstein scientist identified himself as the smartest at the age of 30 years old. However, what about others? At the time of the IQ test, were they really 'smart'?

December 18, 2018