The text of the Postal Clause in the constitution is just "The Congress shall have the power... To establish Post Offices and post Roads". I don't see how this bars the US congress from being able to privatize the post office - indeed, I don't think it even implies that the US must have a post office at all, just that Congress definitely has the constitutional authority to establish one.
They are the basis of the prototype that Bas Ording used to design all the interactions we know today on touch: inertial scrolling with rubber band effect, row of icons for apps, pinch to zoom, etc. It was a fingerwork trackpad with his Director (in 2004!) interactions projected on! It was designed for a Mac tablet, but then the focus shifted to a phone.
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