Editor's Note: A version of this story appeared in CNN Business' Nightcap newsletter. To get it in your inbox, sign up for free, here. Tonight: Global banks are, once again, learning about the dangers of excessive leverage; the Great Stuck may be unstuck, but the Suez saga isn't over; and the housing market has truly gone bonkers. Let's get into it. A little-known hedge fund has caused widespread chaos on Wall Street. And it's a scary reminder of the dangers posed by extreme leverage, secret derivatives and rock-bottom interest rates, my colleague Matt Egan writes.