or log in
A spectacular optical illusion using a chain of closed rings.
Find out whether the marble reaches the finish line faster on the straight or on the curved slope.
How can this pendulum accurately measure time in seconds?
A force can be measured by measuring the twisting of the torsion wire in a torsion balance.
The length of the metal frameworks of bridges change when the temperature changes.
Observe what happens when making sounds with shorter and shorter pieces of the same straw.
This animation explains the most important characteristics of waves through sound waves.
In this experiment we prove that it is possible to cut a bottle with just a string.