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In the human species it takes a year to learn to walk, three years to talk, and even longer to get food. It is precisely for this reason, many scholars believe, that in the human species parents collaborate in parental care for the first years of their children's lives.

What is foreplay for? How long is the ideal duration of sexual intercourse? How does the male orgasm work? And the female one? Major scientific research debunks many circulating myths.

What does it mean to feel good from a sexual point of view? A question of hormones, but also of physical health which must be monitored through prevention and early diagnoses. Does genital size matter? Science's answers to the most common questions about sex and health.

It is one of the most important decisions we make in our lives. Genetically we are predisposed to choose the best opportunities to propagate and transmit our genes, but often the decision is the result of a compromise. What do the scientific studies say?

What happens in the brain when you fall in love? Does love at first sight really exist? What is a kiss for? All the answers from science on that "sweet trap of nature" that is falling in love.

What triggers that strange spark that makes a certain person strike us and not another? What makes us grow in the desire to know her better and be with her? A question of chemistry, but not only. Here's what studies and research say.

Plastic is an extraordinary material, capable of unthinkable performances. Yet it has become a public danger, which risks suffocating the world. But whose fault is it? Meanwhile, science and technology have already found solutions: even creating biodegradable plastic from vegetable waste.

The world population is increasing and everyone needs to be fed. We need more and more food, but we also need healthy food produced with respect for the environment. Here are the ways in which science and technology are trying to overcome the most important challenge.

The Universe is gigantic, but will we ever know if there is something beyond the boundaries of what we can see? And what is it really made of? Will we ever be able to understand where all the matter swallowed by black holes ends up? Cosmologists' answers to the most disturbing questions.

There is a force that acts everywhere in the universe: the force of gravity. It keeps us grounded, but it has also shaped the universe as we know it. If it wasn't there, everything would be turned upside down. But to find out what it feels like when it seems like gravity isn't there, we asked a famous astronaut.

The lifespan of human beings has become much longer. But can we all live to be 120 years old? A short journey to discover the secrets of other species, of what we know about the importance of genetics and lifestyles. Also thinking about the consequences of a world of centenarians.

How many do we have and why they have different colors. And then, what do we need them for, when did we start dyeing them and how can we make them reborn. In this episode the hair reveals its secrets and also explains what is true in the old and new remedies of popular tradition.

Nourishment is one of the central aspects of life: our body is constantly destroyed and rebuilt through food. But not all diets are the same, and some are even false. Controlling your body weight and calorie count may not be easy or sufficient. The topic is explored from multiple points of view to better understand the mechanisms that lead us to eat the right quantity and quality of food.

What is cold? How do frozen embryos survive months? And could the same be done for an entire human being? A journey through low temperatures and their effects. And the cases of children who remained in freezing water, without breathing for almost half an hour, and then returned to live normally, which made researchers discover many things about the mechanism of cold.

The physical structures of athletes. The forces that come into play during a pole vault. Digital technologies used in sport, where data is becoming increasingly important to improve athletes' performance. The scientific aspects of sport.

Memory is the basis of learning, but it is also a still mysterious universe. How big is human memory? And what means do we have to increase our ability to remember? The ability that the brain has to simulate the future thanks to memory and how much we can trust what we seem to remember.

What are the sleep phases and how do they work? What does it mean to sleepwalk? How does a sleeping pill work? How to improve the quality of our rest? Sleeping is a biological need. Sleep is not just a period of inactivity, it is a time when fundamental things happen in the brain. This is why when we sleep poorly we function less well.

The eye is a perfect machine, the result of millions of years of evolution. But also a mechanism that can be deceived, as with optical illusions, or defective, as in color blindness. Increasingly refined visual machines are capable not only of seeing, but also of interpreting images and recognizing human faces and gestures.