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From Apple's website about the iPhone 6 Plus:
iPhone 6 Plus isn’t simply bigger — it’s better in every way. Larger, yet dramatically thinner. More powerful, but remarkably power efficient. With a smooth metal surface that seamlessly meets the new Retina HD display. It’s one continuous form where hardware and software function in perfect unison, creating a new generation of iPhone Plus that’s better by any measure.
Designing a larger iPhone Plus without making it feel bigger was no small task. It required challenging the idea of “big.” It called for narrowing when the natural inclination was to expand. It meant condensing powerful technologies and making chips smaller and batteries thinner, all while making them more capable. And it meant engineering our thinnest, most advanced Multi‑Touch display. All of which yields a dramatically thin design.
Drop Test, Torture Test
About thermite from Wikipedia:
Thermite is a pyrotechnic composition of metal powder, fuel and metal oxide. When ignited by heat, thermite undergoes an exothermic oxidation-reduction reaction. Most varieties are not explosive but can create brief bursts of high temperature in a small area. Its form of action is similar to that of other fuel-oxidizer mixtures, such as black powder.
Thermites have diverse compositions. Fuels include aluminium, magnesium, titanium, zinc, silicon, and boron. Aluminium is common because of its high boiling point. Oxidizers include boron(III) oxide, silicon(IV) oxide, chromium(III) oxide, manganese(IV) oxide, iron(III) oxide, iron(II,III) oxide, copper(II) oxide, and lead(II,IV) oxide.
Thermites have been used for welding metal parts such as railway rails, in metal refining, demolition of munitions, and in incendiary weapons.