The second thing was the headphones. In 1980 there were two sorts of headphones — little plastic «earphones» that sounded horrible, and heavy, bulky headphones that coated each ear with a cup the size of a cereal bowl. Sony modified all that by creating a pair of headphones that had nice sound but weighed lower than two ounces. Sony was ready to do that due to an invention known as the samarium-cobalt magnet. Without these tiny, highly effective magnets, the Walkman headset would have been unattainable.

Sure parts are naturally radioactive in all of their isotopes. Uranium is the perfect instance of such an element and is the heaviest naturally occurring radioactive component. There are eight different naturally radioactive elements: polonium, astatine, radon, francium, radium, actinium, thorium and protactinium. All other man-made elements heavier than uranium are radioactive as nicely.

Technically, any intellectual property that is still below copyright can only legally be reproduced and сколько стоит самолет маленький частный distributed by the proprietor, or by anybody granted distribution rights by the proprietor via a license or different legal settlement. Some elements of the software program, just like the identify or emblem, may also be protected by a trademark.