Comprendre la rareté des métaux rares

In September 2020, the WWF announced that the Living Planet Index had dropped by 68%. What does this figure mean? What is biodiversity? How do we measure the loss of biodiversity, when it is estimated that 80% of the world's living species are still unknown?

Since the first vaccines against smallpox and the work of Pasteur, vaccines have revolutionized the way we treat diseases: polio, tuberculosis, measles, tetanus... Today, in order to defeat the COVID-19 pandemic, all hopes are put in vaccine campaigns, but how to judge the impact of a vaccine? This episode puts the question under the…

Increased economic growth is often associated with our well-being. Can economic indicators really measure something as complex as happiness? This episode takes a look at these much-loved economic indicators.

In this episode, we try to better understand the impact of fishing on the oceans. In 2018, humanity consumed 178 million tons of fishery products. Is this more than the marine environments can handle? The overexploitation of species is real, but more complex than it seems. So, how can we assess it?

In this episode, we will go into space to discover the principle of gravity and why astronauts inside the International Space Station seem to float.

We sometimes hear that sharks are the most dangerous animals in the world. What is the truth of this? Which animal should man fear the most? The crocodile, the snake, the bedbug? You can learn more in this episode.

Is it true that the Internet does not pollute? In this episode, we take a look at the computer and Internet use: rare metals, chemicals, global energy consumption to answer the question.

In this episode, we explain, on a global scale, the contribution of various human activities to the production of greenhouse gases. Human activities include: manufacturing and construction, transportation, electricity and heat production, non-transport fuels, diffuse emissions from coal mining, agriculture, and many others.

Is it true that man is descended from the ape? In this episode, we reconstruct the family tree of present-day man and the modern great apes.

Could humanity survive without bees? This episode explores the role of bees in pollinating the plants we eat.

In this episode, we will see if the figures confirm the doubts about the capacity of our planet to generate food for all its inhabitants by 2050.

In this episode, the numbers will tell us if with global warming, we are really witnessing an increase in natural phenomena such as cyclones.

In this episode, a careful examination of the data will tell us if, as the legend says, we can see the Chinese wall from the Moon (or not).

We sometimes hear that we only use 10% of our brain. What is the truth of this? Let's see what the scientists say.

In this episode, the numbers will tell us if, as a result of deforestation, there are really still so many trees on the planet (or not).

In this episode, we explore the demographic outlook for China and Indonesia to see if it is safe to say that China will still be the most populous country in 80 years.

In this episode, the numbers will tell us if the claim that we will soon run out of oil is true or not. And if the end of oil is the real problem.

We often hear that all the cells in our body have the same genetic heritage. What is the truth of this?

Is it true that we will soon be able to live on Mars? The scientific data on the project of a trip and a stay on the planet Mars will tell us more.

How effective is waste separation? In this episode, we explore the amount of waste produced and the wide disparities in recycling and composting in various countries.

In this episode, the numbers will tell us if, as one might think, cancer is indeed the leading cause of death in the world.

In this episode, we determine if the melting of the ice pack is really causing the sea level to rise.