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Reusable paper

10.06.2005

The ancient Romans wrote with a sharp stick on a board covered with wax, and then erased the writing by heating the wax and smoothing it.

Two Japanese firms have released "Thermo-Mag" material, also based on wax, which allows you to repeatedly print text and drawings, and then erase them. This is a thin "sandwich" of transparent polymer sheets with a layer of wax between them. Black or colored magnetic particles are scattered in the wax.

A special printer with a thermal print head melts the wax along the contours of the letters, and the sheet is immediately passed under a powerful magnet. The magnetic dye is pulled from the melted areas of wax to the surface, and letters appear on the sheet.

To remove the text, it is heated again and passed over a magnet, and the pigment is pulled inward. The process can be repeated any number of times. The resolution of the new print material is 100 dpi.

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Cyborg cockroaches 19.03.2015

Scientists from Texas A&M University (USA) equipped a cockroach with a microchip, from which two electrodes were directed to the nerves that control the legs of the insect. This made it possible to control the movements of the "cyborg" with the help of electrical impulses and to control the movement of the insect from the remote control.

In laboratory tests, researchers were able to control the movements of a cockroach about 70% of the time, and in field tests, up to 60%. The microchip is powered by a tiny lithium battery, so that the total mass of the "backpack" placed on the insect's back does not exceed three grams. Scientists noted that although cockroaches are able to carry loads five times their body weight, in the end this can reduce their endurance.

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