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post refrigerator

03.03.2001

Refrigerated mailboxes have been installed in the lower halls of several residential buildings in one of Helsinki's suburbs.

There are three compartments in the drawer, as in any normal refrigerator: a low-temperature compartment for storing frozen food, a compartment for fresh products and for vegetables and fruits. The total volume of such a box is 200 liters.

This novelty should serve the development of food trade via the Internet. Having ordered groceries, you do not have to stay at home: they will be delivered and will be waiting for you in the mailbox. The key to the box is available from the delivery service.

If the experiment is successful, the houses of the Finnish capital will be equipped with refrigerated mailboxes.

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How to protect your mobile phone from theft 20.11.2002

All over the world, the problem of protecting mobile phones from theft remains very relevant, for which several methods have been proposed.

So, the British company "Allied Commercial Developments" has created a device called "Kobra", which is mounted under the rear panel of the handset and fits 80% of models of modern devices. A pin is inserted into a special connector, similar to a grenade pin. The pin is tied to the strap, and that - to the wrist, case or belt of the owner. When you try to steal the device, the pin is released, and after a few seconds, a sound signal is heard with a strength of 120 ... 140 dB, which exceeds the pain threshold of human hearing. It will not be easy for a thief to escape with such a squealing mobile phone.

Another group of researchers from the University of California (USA) has found a way to blow up silicon chips by a special electrical signal sent if the phone falls into the wrong hands. A layer of gadolinium nitrate is deposited on a part of the crystal of the mobile phone microcircuit, which acts as a detonator.

When a coded radio signal arrives, the detonator is excited, and the microcircuit simply melts. The thief has no choice but to throw away the already damaged stolen item.

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