Thierry Gouvenou explains in greater detail the challenges of a flat stage, as the outcome is often too predictable. It's up to him to design a course that will force riders out of their comfort zone. One solution? A mountain stage and rough terrain.

The Mediterranean is the most polluted sea in the world, and some scientists are on a sailboat studying the problem by collecting plastic samples for analysis. For a few hundred euros, some excursions are open to the public, who get an opportunity to help the cause.

Patrice and Sophie discuss Anne Hidalgo's contribution to the city of Paris. As mayor, she is a controversial figure best known for banning cars from the banks of the Seine. Many Parisians either love her or hate her.