* Jessica Pressler: John Mack is back

* Unsafe bets? J.P. Morgan’s Voldemort

* PayPal, Part II: The Facebook Mafia arrives

* Matthew O’Brien: Why baseball players are underpaid

* Morning Call: U.S. futures point lower and the Nikkei keeps sliding.

* Connie Loizos: In Ohio, Mark Kvamme faces a ticking clock

* Mark Perry: Celebrating speculators

* A primer: Convertible note seed financings

* Jonathan Weil: Groupon IPO scandal is the sleaze that’s legal

* Luke Timmerman: Biotech investing isn’t just for investors anymore

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