Italy

Ferromagnetic liquid and bolt

Guardbot - unique military robot for surveillance.

The device is designed to patrol territory and detect improvised explosive devices and chemical substances. Guardbot is equipped with 360-degree surveillance cameras, GPS and a microphone for recording.

It can move on land and water, transmitting data and images in real time. This robot is able to navigate freely both on land and on water, with a speed of up to 1.8 m/s in the latter case.

Glass and glycerin have almost the same (1.57 and 1.47) refractive indices, so it is impossible to see the difference between them with the naked eye under certain conditions.

Hamburg

Abandoned Viking village in Vestrahorn, Iceland

Wahu smart outsole changes its characteristics depending on environmental conditions. During the ice, rubber spikes crawl out from the sole and improve traction.

French flamethrowers during the battle of Verdun, February-December 1916

Crazy experiment
10000 liters of coca-сola + mentos

The house is at sky level.
China

A 1985 prediction of what Michael Jackson would look like in the year 2000