John Wilkes Booth (1838-1865) it was son of a famous actor, Junius Booth. The family lived on a farm served by slaves in the state of Maryland. John excelled in sports and was uninterested in academic life, dropping out of…
»> This identification indicates the sizes of each of them. “At first, the letters were a notation used only by specialists to give an idea of the length, diameter and shape of the pile”, says chemist José Maurício Rosalen, from…
The helicopter was not born overnight, from the mind of a single great genius. This flying machine was being developed little by little. Centuries passed between the discovery of the principle of helicopter flight – the use of a horizontal…
»> Yes, the Australian marsupial mouse, a small rodent about four inches long. His life changes radically when he reaches “adolescence”: his testicles enlarge and reach almost a quarter of his total weight! The production of sperm and testosterone, the…
The most immediate reason was the sinking of several Brazilian merchant ships by German and Italian submarines during the first half of 1942. “As a result, the population took to the streets in Rio de Janeiro demanding the declaration of…
And the afraid of laughter, both their own and that of others. Like all phobias, the fear is irrational, and the body responds with changes such as dizziness, palpitations, nausea and sweating, causing discomfort. The cause is still unknown, but…
By the shape of the head: that of the venomous ones is triangular. That, at least, is what the saying goes – but that is a dangerous generalization. Differentiating between them is far from being that simple. Other anatomical details…
»> ILLUSTRATES: Alexandre de Souza QUESTION: Tarsila Santos Rodrigues, Recife, PE These annelid animals are hermaphrodites, that is, they have both sexes – therefore, they are capable of fertilizing and being fertilized at the same time. Even so, the earthworm…
The first difference is in size. Both are defined as an expanse of water surrounded by land, but lakes are larger. The problem is that there are no minimum or maximum dimensions for each of them, which can lead to…
Breast milk is produced under the command of several hormones that begin to act in the woman’s body even before the baby is born. It is during pregnancy, for example, that the breasts are being prepared to become a powerful…