stephanie: in 2013 and 2012 cta suffered. how do you know when to go cta and not? that way about eight cta, the way they do about a person. luke: it is part of a portfolio of exact -- of investments. it has a lot of sense to have them in a portfolio. it makes sense is when the opportunities are right and correlations are low ctas will make a lot of money. despite the big moves last year discretionary guys struggle to make money. the thing is that ctas will do well when correlations are alone. can i predict when the correlations will be alone next year, i'm afraid i can't and i don't think anyone else can. correlations are back to long-run historical levels at the moment. it is not extremely low, we just had an unusual time when the fed started qe1 we had three years were correlations were particularly high. we have an environment where ctas work well. fabio: how are you preparing for greece, and he will to better humans or computers during this uncertain time? luke: it depends on the outcome. if the outcome is different if we really do get a radical shakeup in mark

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cta customers standing in the street next to snowy sidewalks. frustration rolled in on twitter.ed ward sent this street at 65th and mobile. a side street at ravenswood where he said dozens of cars got stuck. parents learned to overcome winter obstacles to get students back to school on this messy morning. cdot says help it on the way with more than 450 pieces of equipment currently working the roads. today 200 pieces of rented equipment was added to clear snowy neighborhoods. for priscilla, patience and time have run out. >> what are we going to do in case of an emergency? how is an ambulance going to get through? firetrucks, how are they going to get in here? there's no way. >> reporter: and it is very clear that additional 200 pieces of equipment will really come in handy. just take a look at the street i'm standing in now and how much snow is packed down here. look up we're even getting more snow right now. an additional 1 to 3 inches on top of the 19 inches we already saw in sunday's historic snow. just doesn't end for us here in chicago. michele reliford. >>> another drone

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