They are the largest laboratories ever built by man. From the outside, they look like large tunnels, which can be straight or ring-shaped and can be several kilometers long. Inside them, the particles that make up atoms – such as…
In general, methods that use hormones to prevent ovulation – and therefore pregnancy – are considered the most reliable. The contraceptive pill, for example, is more than 99% effective when taken correctly. The vaginal ring and the transdermal patch, which…
»> It’s simple: just look at the plastron, the underside of the carapace, what would be the animal’s belly. “Male tortoises have this deeply concave part of their shell to fit the female’s when mating,” says biologist William Matiazzi, from…
– (Anthony Mazza/) Reader Question Pedro Saliba, Sao Paulo, SPIllustrates Anthony MazzaEdition Felipe van Deursen It is a theory that says that all people are connected by a small number in connections. The origin is not scientific, but literary: it…
»> To eliminate foreign substances from the airways and lungs. A cough is a noisy expulsion of air through the mouth caused by a sudden contraction of the diaphragm. It defends the breath from the aggression of microbes, flu infections,…
»> The first surfaces capable of reflecting images began to be made around 5,000 years ago in ancient Sumeria – a region in present-day Iraq, encompassing areas close to the city of Baghdad. Mirrors of that time did not produce…
– (Érika Onodera/) The image above illustrates a twisted and a normal testicle. Torsion happens when a tube called the spermatic cord, which connects the testicles to the abdomen, accidentally rotates and «twists». Through this cord pass veins, nerves, lymphatic…
It may seem obvious, but it’s the simple truth: planets rotate because there is no force to stop them. The fact is that everything tends to maintain its movement if nothing appears to oppose it. This story began with the…
Until the eleventh century, almost everyone ate with their hands. The most educated were those who used only three fingers to bring food to their mouths. In that century, Domenico Salvo, a member of the court of Venice, married Princess…
HOW IS THE SEX? PrehistoryAntiquity | Modern Age | Today | In the future Prehistoric men already distinguished sex from reproduction, used natural cosmetics to increase flirting, had sex in very different positions than daddy-and-mommy and even used contraceptive methods.…