* 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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