biologist jerÓnimo reyes works at mexico's largest public research university, the unam. e's planted an 800-square-meter garden on the roof of a private school. the building is located right in the city center. rooftop gardens like these have become increasingly popular in mexico city. >> there's no space down below for parks or gardens like these. mexico city is overpopulated and there's nowhere to plant green areas like this. but they're just what the city needs, because the plants produce oxygen and capture pollutants. >> in summertime, the layer of vegetation helps cool the buildings down. and in winter, they provide some insulation, so that less heating is required. most of the plants here are succulent, meaning they store moisture in their fleshy leaves. they can also survive for long periods without water. as a result, the garden requires very little maintenance. it's ideal for busy people who want to relax, not work, outdoors. the researcher has set up a kind of laboratory on the roof of the university. with the help of his students, he wants to find out which plan

>> the client's criminal background is a hered herring. this is a case two innocent unammed citizens walking down the street who had to flee for their lives unarmed with their hands in the air. criminal background or not everyone is entitled to constitution constitutional protection. criminal record, "a" student, honor roll, whatever it is, the point is you can't gun down innocent people. >> reporter: understood. credibility, however, key especially in assessing testimony, when they hear about the criminal background and types of crimes involved, do you think it hurts your client's credibility? >> i think it's something they may take into consideration. he met with the fbi, the justice department, the prosecutor's representative, detective, and at that time, over a week ago, he laid out his whole life to them. they asked him about his criminal background. they asked him about the matter that he had a warrant out against him. he talked to them about it at length and in detail. >> reporter: if you are counsel and your client takes the stand and says his testimony with, let's s

. >> at the heart of this is the death of 18-year-old michael brown shot and killed while unam by darren including twice in the head. >> the medical examiner says when the officer opened fire the teach was everyone whatted forward or raising his hands to surrender. >> the muzzles with 1' or 2' arrest at time of discharge. >> police say brown approached the officer's car looking for a fight. >> it is our understanding in the miss car there was a struggle over the officer's weapon. >> what happened in the moment when brown and the officer came nice to face is keep whether he will be charged. the grand jury could hear the testimony on wednesday. >> there is month sign the city will return to normal soon. the school year start is delayed. there is a no-fly zone over the city. the national guard is going nowhere, either. >> police hope witnesses can help find two hit-and-run drivers who hit two people along the same stretch of a busy road two nights in a row. a map was hit last night a block away from another hit-and-run that killed at man on sunday. the victim suffered life-threatening injur

now, and this if this substance, ultimately down the road russia can destruct the apply of energy from europe, and that unamguously will tip russia and europe into recession, it's a lose-lose situation. it is get another reason why people are worried about the economy in europe. should we be worried about contagion to the united states. >> yes, we should. as we point out. it's a trading partner, it is, as a region, one of the biggest in the world. i tell people you can't be a good house. if the global neighbourhoods deteriorates. then the u.s. would feel it. the s&p hit a record above 2000. in fact, when you look at the mark, the s&p, it's up 35% since the beginning of 2013, some people are warning that this market may be overhead. the other argument is much of the run is investors brushing off world event, interest rates are low and stocks the only game in down. what do you think. both arguments are right. let me explain, amazing resilience on the stock market. it shows itself in the ability to brush off economic weakness. why is the market so confident. for two reasons. from one, the markets believe and h