A century or two ago, people used to sleep twice a night. In the evening, they would change into their pajamas, put on a nightcap and snuff out the candle. They would sleep for several hours and then they would get up in the middle of the night, light the candle and engage in some …
Watching a flock of birds flying high over a plain, you may wonder what their experience and view of the areas they fly over is like. Scientists often wondered as much, until they discovered that the birds sleep while flying. This by all means explains how it is possible for birds to fly constantly for …
The name of Henrietta Lacks, a poor African-American woman from Virginia, has been inscribed in medical books because for decades now her “immortal” cells have been used for exceptionally important medical purposes. When a book was published, her name became globally known. Who was Henrietta Lacks? This African-American from a poor Virginia family, who had …
For a long time now the letter shown in the photo has been widely circulated on social networks. It is a letter that was allegedly sent to Albert Einstein from the University of Bern on June 6, 1907. In it, the Dean writes to the greatest physicist of the 20th century, who at the time …