Sodium bleach or hypochlorite, developed over 200 years ago, is now found in homes around the world and is one of the most widely used disinfectants. But how does it kill bacteria?
They do this at a rate of 4 centimeters a year, at least twice as fast as toenails. This is because those of the hands suffer more wear, since they are used, for example, to open cans, boxes or objects, and also to scratch.
Sometimes the simplest of things becomes extremely complex when you look closely. For example, how many times have you turned a sheet of paper into a sphere before throwing it in the trash can? Have you ever wondered what mechanism we use to turn a simple sheet of paper into that resistant ball? Two physicists from the University of Massachusetts, Narayan Menon and Anne Dominique Cambou, have asked themselves this question.
The truth is that no. Sea water contains large amounts of salt (sodium chloride), specifically more than 10 grams per liter if we take the average of all the world's oceans. The molecules of ordinary soap are made up of sodium atoms bound to fatty acids.
The cicada or cicada, 'Cicada orni', stuns hot summer days in Mediterranean countries with its incessant sound, and although we call it a song, it is actually more of a percussion concert.
Vampire bats ('Desmodus rotundus') have a sensor capable of detecting the heat of the blood of their victims, which allows them to quickly find the veins of their prey to give an infallible bite, as revealed by a University study from California, San Francisco (USA) and the Venezuelan Institute for Scientific Research.
Yes, it's called Doga (a combination of dog, 'dog', and yoga) and it's taking America by storm. It is a program that dogs must do at the end of the day to avoid the stress of "following" the pace of Western life. It arises from the application of yoga techniques to relaxation exercises and stretching for pets.
The skin is damaged by ultraviolet (UV) radiation from the Sun. Shorter wavelength (UV-B) rays have more energy and are more damaging, but both UV-B and UV-A rays can cause burns, skin cancer and premature aging.
Danni Büchner is invited to Sam Dylan's Halloween party. But the "Goodbye Germany" emigrant has no desire for many other party guests. And find clear words.
