Lenovo engineers have managed to make some really light equipment, while resistant. Both laptops – Lenovo LaVie Z HZ750 as Lenovo LaVie Z HZ550 have a housing made of a special alloy that combines lithium magnesium (Mg-Li) the materials used are half heavier than aluminum, but as strong as alloy magnesium typically used so far in some cases for laptops. And they are not only lightweight machines, but are also really thin, because they measure 16.9 millimeters thick. Hence they are truly ultraportable computers.  The Lenovo LaVie Z HZ750 is a convertible laptop that turns into