How and why do cicadas sing so loudly?

»> Insects utilize sound for various purposes such as communication, attack, defense and mating. In the case of cicadas, the song is used by males to attract females and thus perform copulation. “The cicadas’ song is produced by an organ…

How does the cell phone work?

Basically, it’s nothing more than a telephone connected to a radio similar to the old walkie-talkies – only much more sophisticated. The difference is that, if they worked exactly the same as walkie-talkies, they would need a frequency band for…

How is exorcism done?

In the ritual, the priest prays and throws holy water over the possessed person. This if we consider the ceremony of the Catholic Church, more discreet. In evangelical churches, the exorcism takes place in front of the public and the…

Why is adolescence such a difficult phase?

Illustrates: Werllen Holanda Because it is a phase of physical, psychological and social changes. This stage exactly marks the transition from childhood to adulthood – according to the World Health Organization, adolescence begins at 10 and ends at 20. During…