The dot-com bubble began to burst in the spring of 2000, when presidential candidates George Bush and Al Gore emerged from their party conventions, the human genome project unveiled its first draft, and ‘American Beauty’ dominated the Oscars with five awards, including best picture. More than a quarter-century later, however, those same three stocks are leading an old-tech revival that has powered U.S. markets to a series of record highs, paced by an insatiable appetite for all things related to artificial intelligence. Investors are seeing few signs of a pullback like the one during the turn of the century crash that rocked tech markets for a decade.