A black-and-white version of a colorful PowerPoint presentation is all you need sometimes, even when you've spent a lot of time jazzing it up to wow the audience. For example, you may need to fax it ...

A little more than a year ago, on a trip to Nairobi, Kenya, some colleagues and I met a 12-year-old Masai boy named Richard Turere, who told us a fascinating story. His family raises livestock on the ...