If you’re reading this, take a moment to thank Doug Engelbart. At a time when computers were big, expensive, isolated, finicky, and terribly difficult to program and use, this unassuming genius had a vision of a digital future that was so far ahead of its time that few of his peers took it seriously. He is widely credited with inventing the mouse, but that’s just a tiny part of his grand vision. Graphical user interfaces, interactive computing, the Internet, and more, owe their existence at least in part to Engelbart’s visionary work. Thank you, Doug.
If you misspell a word in a paper or use the wrong font in a presentation, your error may be embarrassing. If you use the wrong formula in a spreadsheet, your error might be devastating. According to a recent study, the typical spreadsheet is riddled with math errors. 
