The Parthenon fragments that the Vatican has returned to Greece, photos

It may sound like a trivial question, but in fact it is not trivial at all; on the contrary, it holds within it very important physical and philosophical questions. The Washington Post noted that this question is stirring up some of the people on Twitter these days.

The debate was generated by a tweet from journalist Jacqui Deevoy, who wondered how it was possible that the sun had 'changed colour' from what she remembered as a child. The answer, however, is one that leaves one somewhat appalled, as there is no real unequivocal answer.

After all, children do not make a mistake by drawing the sun as a big yellow ball, but it is not a completely right answer. After all, light is just the perception of the wavelength of radiation emitted by the sun, and therein lies the whole secret.

A large part of human activities that can have an impact on the environment is carried out at sea (fishing, maritime transport, coastal tourism), in the oceans and on their shores. This obviously has a very negative impact on the environment if citizens and companies are not educated to be more respectful of the waters.

The 'Blue Economy' is a key project for the European 'Green Deal', obviously a series of measures to make energy production and the lifestyle of citizens throughout Europe more sustainable and less environmentally damaging.

The 'Blue Economy' not only focuses on reducing pollution and more sustainable exploitation of the seas in the long term, but also offers enormous potential for economic and job growth for all European citizens. Already 4.5 million people on the Continent are engaged in it, and much more work could come.

Napoleon Bonaparte, often also referred to as Napoleon, was a French politician and general, founder of the First French Empire and protagonist of the first phase of contemporary European history, known as the 'Napoleonic Age'.

His conquests throughout Europe and beyond make him one of the finest military strategists ever, but his importance is not limited only to victories in the field. Also important were some campaigns, such as the one in Egypt, which returned priceless treasures to the world. 

His life, studded with continual ups and downs, intrigues, murders and love affairs, ended in 1821 on the island of St Helena, in exile, due to stomach cancer. Although his life has filled the history books for over a century, some curiosities may still have escaped you.

Saving electricity at home not only helps reduce your bills, but also helps preserve the environment.

With small changes in your daily habits, you can make a difference.

In this article, we will explore 8 ways to reduce electricity consumption and become more sustainable.

These museums offer a unique experience that combines art, science and optical illusions to challenge visitors' perception of reality.

Here you can experience walking on a ceiling, becoming a giant, or disappearing into a swirl of colors.

Illusion museums are designed to stimulate the mind and make you challenge your perception of reality. In this article we will take you on a journey through some of the best illusion museums in the world, from New York to Istanbul to New Delhi. You will discover what their most amazing attractions are and how they can change your perception of the world.

Are you ready to be surprised and enchanted? Then take a seat and let's begin our journey through the 10 incredible museums of illusions in the world.

There are many rankings that suggest which are the best countries in the world to live in. However, if you have children in tow, the factors to consider are probably very different. 

The quality of education, the availability of green spaces in residential neighbourhoods, the safety of those neighbourhoods, but also what and how parental leave is in place in that particular country. Unicef has carried out many studies on the subject, although it often focuses only on the rich countries of the world. In any case, they can already be a very good general indicator useful for families who want to expatriate or change countries to live in.

The BBC has collected some of these studies, and compiled a ranking of the five best countries in the world to move to if you have children.

Some ancient coins are worth a lot today: the history of coins has fascinated mankind since ancient times and the value of these coins has often been associated with their rarity and history.

Today, some of these rare and faceted coins can be worth a fortune to collectors and enthusiasts.

In this photogallery, we present a selection of rare coins from around the world, dating from different historical periods and with a current value that might surprise you. Discover with us the beauty and value of these rare coins in this exclusive photo collection.

Cats have always inspired artists of all ages and genres, often becoming the protagonists of works of art of great historical and cultural significance.

In this photo gallery we will take you on a discovery of five famous paintings in which felines are the absolute protagonists, admiring how their beauty, majesty and mystery have inspired great artists of all times. You will discover how these animals have been represented through the centuries, in different forms and styles, creating works of art of great visual and emotional impact.

Are you ready to enter the magical world of cats in art? Let's get started!

Every language has its own characteristics that make it unique and special, even in pronunciation. Interesting, from this point of view, to know which Italian cities are the most difficult for foreigners to pronounce. 

This is revealed by Preply, a global language learning platform, which has carried out a study on the Italian cities, provinces and regions where people have the most difficulty in correct pronunciation, so much so that it would take more than one listening before they are assimilated and repeated correctly.

Let us therefore discover in detail which Italian cities are the most difficult for foreigners to pronounce.

In this article we will explore eight vintage toys that you may have in your home without knowing that they have become invaluable today.

From early toys Lego to cuddly Furby, from cards Pokemon to Hot Wheels, some of the toys we loved as children have become highly sought-after collectibles.

Whether you are a toy enthusiast or just curious, this photo gallery will reveal some hidden goodies you may have in your home.