Every investing era gets personified. In the 1980s it was junk bonds and Michael Milken, in the 1990s it was the bond king Bill Gross, in the 2000s it was John Paulson’s big short, and since 2015 it has been Cathie Wood. Cathie Wood (whose parents both emigrated from Ireland) set up ARK Investment Management in 2014. She jumped on two hot investment trends. The first was for actively-traded exchange-traded funds. These are funds full of expert-picked stocks that ordinary investors can easily buy and sell on an exchange, just like an ordinary stock.  The second trend is the booming…