It all depends on two factors: the depth with which the needle penetrates the body and the chemical composition of the applied substances. Basically, there are four types of injection: intradermal, subcutaneous, intravenous, and intramuscular. The difference is in the…

Reader Question – Agatha Veroneze, Posto da Mata, BA With several chambers with specific functions and tunnels that connect them. The arrangement of these sites depends on several factors, such as the species of ant (there are over 10,000!), its…

Because they are no longer needed. The ancestors of these animals, such as Archeopteryx, a mixture of bird and lizard that lived about 150 million years ago, had well-developed teeth. But, over time, the dentures lost their function and ceased…

– (Eduardo Belga/) 1. Son of a woman who considered herself a witch, Idi Amin was born in Uganda between 1924 and 1925 – the exact date and city are unknown. As a young man, he enlisted in the British…

(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…