Magic box Magic box . It describles the principle of light reflection . There is a priece of mirror in the box. Place it diagonally. Put the coint into the box , but it is dispeare because you light reflection phenomenon. That 's the secrets for many magic...

Sound wave Sound wave is invisible.When we emit audio singal through a closed end of cylindrical tubular barrels, we can obsever sound wave's activities clearly. And this kind of sound wave is called standing wave, also known as snow wave .  ...

Geometric tunnel Geometry fraction . You have to pick up right fraction and put them into the right position on the "wall".90*50*90CM  ...

Electromagnetic gun Electromagnetic gun: After electrified,AC generate alternating magnetic field through coil and it make the samll tetal ring which go through the soft iron core produce swirl. The direction of swirl's magnetic field . Two magnetic fields...

Birdsong Forest Birdsong Forest                       Through the voice device to show us all kinds of birds...

Non-drumhead Drum Non-drumhead Drum             Through the optical signal to achieve the drum. The audience did not ask the drum of the drum hammering, as trigger the photoelectric control...