In part four of this episode on "The Discoverers," Galileo, now a reputable scholar at the University of Padua, proceeds to make a telescope out of lenses with the help of his instrument maker, Marc'Antonio. In this cartoon, an attempt is made to explain Galileo's discoveries.

Have you ever wondered where the wool from your luxurious angora sweater comes from? At the Ferme de la Croix, a lovely lady breeds angora rabbits and goats on her farm. She explains the shearing process and how she cares for her pets. We learn that one rabbit can yield forty balls of angora wool every hundred days. That's a lot of sweaters!

Episode nine of this series focuses on Galileo, a prolific inventor and scientist. He discovered the principle of the simple pendulum motion, very useful in the measure of time and later in the making of clocks.

In this video, a young Galileo gets one of his first revolutionary ideas on how to measure time. Pretty impressive for a fourteen-year-old, huh?

In this video, a representative at an ecology trade show presents some innovative building materials that are eco-friendly and will allow you to save some money on your energy bills. These materials are made out of gypsum cellulose and are used for insulation.

The Maestro explains how the revolutionary ideas of the early discoverers, which we now take for granted, were not always well received. Before Galileo, for example, everyone believed that the sun and all the other planets revolved around the earth!

In the last segment of this Il était une fois... episode on technology, we learn more about what vertical farms can do to help the planet thrive. The first commercial vertical farm recently opened in Singapore.

Our eco-friendly home show representative explains the benefits of cellulose wadding versus fiberglass, two insulation materials commonly used in houses.

The students present the Maestro with various solutions for eliminating pollution on our planet, including vertical farms and biotechnology.

It takes a lot to decorate the 31-meter high Christmas tree on Strasbourg's Place Kléber: ten technicians, two bucket lifts, 75 thousand lights. Luckily, the operation is being managed by Antoinette Pfimlin, who has 20 years of experience decorating giant trees in a hard hat.

A group of smart young people found revolutionary ways to solve our planet's woes. Electronic books, Internet mail and much more...

A Primacalc representative introduces a revolutionary eco-friendly device that softens hard water. The device can be installed by a savvy handyman or a plumber.

Modern technology comes to the rescue! Planet Earth has a chance of recovering from man-made pollution.

Technology not only helps clean up our planet, but also allows us to explore the entire universe. According to the astrophysicist Alfred Vidal-Madjar, in five hundred years, we will have visited all the planets in the solar system.

At the Eco Habitat salon, Olivier Brunet from the "Terres Cuites de Courboissy" (Courboissy Terracotta) tile factory explains how they make floor tiles that are both eco-friendly and pleasing to the eye. One of their clients even had his floor tiles made to look three dimensional!