What is the rarest animal in the world?

Credit: Disclosure/Reproduction Reader Question – Julia Garzuzi, Curitiba, PR It is the turtle of the species Rafetus swinhoei, with only four known specimens – a couple in a Chinese zoo and two males in lakes in Vietnam. Data are from…

How is Chanukah celebrated?

– (Pablo Maia/Strange World) Call of Hanukkah in English-speaking countries, this jewish feast hard eight days and, although it usually happens in December, it has no connection with Christmas. Its origin is older. In 165 BC, the Maccabees (a group…

What is the Fibonacci Sequence?

It is a sequence of numbers that appears encoded in many natural phenomena. Described at the end of the 12th century by the Italian mathematician Leonardo Fibonacci, it is infinite and starts with 0 and 1. The following numbers are…

How did the gas chambers work in WWII?

In Nazi concentration camps, German officials locked prisoners in rooms that were infested with pesticide. The chambers were not the first method of mass extermination used by Germany. Until 1941, SS officers (Hitler’s military police) disposed of small groups of…

How does a wound heal?

André Alves, Sao Paulo-SP It’s like calling a plumber and a mason to fix a burst pipe in the kitchen. First, the plumber stops the leak. Then, the mason cements the wall and leaves everything brand new. That’s more or…