543
Find out the reason that pencils are always yellow
Historically: it is believed that the first graphite pencils "yellowed" around 1890, and it was done specifically - say, so it will be easier to find on the desktop. But the history of pencil is much more ancient than you think.
At the beginning of the XIX-th century the graphite supplied to America from China, in connection with the sellers of stationery like to emphasize that their products are imported from distant mysterious Asian country. In China, yellow - the color of reverence and respect, which is why American retailers began to paint in a Chinese graphite pencils - thus they sought to emphasize the quality of the goods. However, according to the historian Henry Petroski (Henry Petroski), the first company to come to this marketing move, was a Czech company «Koh-i-Noor Hardtmuth». Today the majority of slate pencils sold in the market, yellow, but now it no longer means "elitist" origin, rather it is a tribute to tradition.
via factroom.ru
We are living in the most peaceful era in human history
Scientists have discovered cold stars - Y-dwarfs