NEW YORK (AP) — Author-vloggers Hank and John Green often end their popular “Crash Course” videos with a donation appeal to keep the YouTube show “free for everyone forever.” The multihyphenate brothers now hope they’ve figured out a way to do just that — by changing their production studio’s tax status. Their educational media company Complexly, which has garnered billions of views through web series that explain just about every classroom subject from animal biology to Latin American