(Renato Augusto Martins/Wikimedia Commons (CC BY-SA 4.0)) Anything. The noise is generated by the beating and friction between the very parts that make up the end of the rattlesnake’s tail, called rattles. There are no stones or balls that stir…
1. Tamerlane (or Timur) was born in 1336 in a region called Transoxiana, in present-day Uzbekistan. He was the son of the head of a small Mongolian tribe called Barlas, which was part of the empire founded by the famous…
Influenced by Greek mythology, so much so that Athena, goddess of war and wisdom, had an owl as a mascot. The Greeks considered the night as the moment of philosophical thought and intellectual revelation and the owl, being a nocturnal…
Reader question – Cainã Chiarini Pena Motter, São Lourenço, MG There are thousands that run away from the standard. Some officially registered examples: – Hugolinda – Enekelen – Crizeimon – Xemidonium – Abelive – Limdobim – Jatchuca – Velvet –…
Narrow, highly flexible and with a bifid end (a fancy synonym for “splitting in two”), the tongue of these reptiles is used to capture the scents around it. In other words, it can be considered the olfactory organ of ophidians,…
The barcode is nothing more than the graphic representation of the sequence of digits that is printed just below it. The advantage of bars is that they can be identified quickly, and without risk of error, by portable optical reading…
This expression causes some confusion. “The idea was created that every cheap horror or science fiction movie is a B movie. The authentic B movie stayed in the past, in the 30s and 40s. The generalization by critics is incorrect”,…
(/) reader’s question Sarah Christine Vieira e Silva, Uberaba, MG illustrates Yasmin Ayumi Originally, gold is yellow. But, as it is a very malleable metal, it needs to be mixed with other chemical elements in order to form an alloy…
1. An archaeological site can be discovered by chance (for example, during public works) or through topographic and cartographic analyses, aerial photographs, electromagnetic detectors or other geoscientific methods. The area is usually explored by teams ranging from three to 80…
(/) Sound travels through the air in concentric waves, like a stone falling into a pond. The sound barrier is the speed limit at which an airplane can move through the air without running over the sound waves emitted by…