Emeralds

More expensive than diamonds?

6 April, 2016

Clean transparent emeralds are more expensive than diamonds.

Tetrachromacy how many colors

How many colors?

6 April, 2016

Tetrachromacy is the innate human ability to distinguish up to 100 million colours. A normal human eye distinguishes only about 1 million.

Vostok Station Coldest Temperature

The lowest temperature

6 April, 2016

In July 21st, 1983 the Vostok station recorded the lowest temperature on Earth: -89,2°C.

Honesty of tired people

Which people are more honest?

5 April, 2016

Tired people tend to be more honest. If you feel that your strength is up to limit, it's best to tactfully keep your mouth shut, just in case.