The power of the first lasers was measured by the number of razor blades the laser beams could pass through.
In Italy, 95 liters per year of non-carbonated bottled water is drunk per capita, making it the first country in the world in that category.
A four-year-old child will, on average, ask about 437 questions a day.
The last US state to introduce mandatory photo on the driver's license was New York, 1984.
Asian elephants have the longest gestation period of all mammals, it lasts 608 days.
The candle flame is blue at the bottom because of the oxygen intake and yellow at the top because it burns it there.
