The brachistochrone problem

Find out whether the marble reaches the finish line faster on the straight or on the curved slope.

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The length of the metal frameworks of bridges change when the temperature changes.

String saw

In this experiment we prove that it is possible to cut a bottle with just a string.

Hot air balloon

A hot air balloon is a balloon aircraft which is lifted by hot air.

Types of waves

Waves play an extremely important role in many areas of our lives.

The clever karate master

Can we break a stick with the weight of only a few sheets of paper?

Submarine operation

Submarines submerge and surface by changing the average density of the hull.

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