Dare to take on the new challenge proposed by Chantal Ferrer for «Free fall», related to gravity and our perception of weight.

History of the relationship between electric currents and magnetic phenomena.

When a body descends in air or another fluid, what determines its acceleration is the gravitational force minus the friction, not its mass.

In resonance, the force transmitted to the object may be relatively small, but when it is transmitted with the right frequency, it oscillates with great amplitude.

If we hang a magnet by a thread, it always aligns itself in the same direction, even if there is no other magnet nearby. This is a compass and responds to the Earth's magnetism.

In the 17th century, it was difficult to achieve and maintain a partial vacuum. In the 21st century, the challenge is to achieve an ultra-vacuum in the laboratory such as we could never have dreamed of.

For there to be sound, there must be a vibrating source, a transmitting medium that propagates the vibration at a certain speed, and a receiver that is set into vibration when the wave arrives.

There is no way to force a pendulum to oscillate at a different rhythm, determined exclusively by its length

Using simple materials like plastic bottles, straws, modelling clay, and syringes you can witness many interesting phenomena relating to air and water pressure.

The historian of science Alexander Koyrè summarised the scientific work of the sixteenth century as a gradual understanding of the works of Archimedes.