The 'witch's stone' made by Russian military students turns out to be a high-tech spy device
This rock-shaped spy device was developed by Voronezh Academy as a new way to secretly track enemies.Remote eavesdropping technique thanks to light bulb vibration
Observing the sound vibrations around light bulbs, the scientists demonstrate the techniqueThe ultra-powerful weapons are 'covered' by the beautiful shell
An umbrella, a watch or even a lipstick can become the dangerous 'weapon' of spies amidst enemies.