Fur trade marten furs could generate in international markets spurred a "fur fever" in which many Russians moved to Siberia as independent trappers. From 1585 to 1680, tens of thousands of sable and other valuable pelts were obtained in Siberia each year. The primary way for the Muscovite state to obtain furs was by exacting a fur tribute from the Siberian natives, called a "yasak". "Yasak" was usually a fixed number of sable pelts which every male tribe member who was at least fifteen years old had to supply to Russian officials. Officials enforced "yasak" through coercion and by taking hostages, usually
PC Paintbrush PC Paintbrush PC Paintbrush is graphics editing software created by the ZSoft Corporation in 1984 for computers running the MS-DOS operating system. It was originally developed as a response to the first paintbrush program for the IBM PC, "PCPaint", which had been released the prior year by Mouse Systems, the company responsible for bringing the mouse to the IBM PC for the first time. In 1984, Mouse Systems had released "PCPaint" to compete with Apple Paint on the Apple II computer and was already positioned to compete with "MacPaint" on Apple Computer's new Macintosh platform. Unlike "MacPaint", "PCPaint" enabled users