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Imagine a system where heat flows from a hot region to a cold region under the constraint of the traditional second law of thermodynamics.

>> reporter: cnn has hired grant fredericks and his team at forensic video solutions to analyze the hundreds of hours of surveillance from the high school. although he does not believe that jumpy video is the result of editing, he says there are some other major problems. >> those files are not original files. they're not something that an investigator should rely on for the truth of the video. they've been altered in a number of ways. primarily in image quality. and likely in dropped information. information loss. there are also a number of files that are corrupted, because they've not been p...

Number of ways primarily in quality and likely in dropped information. information loss. there are a number of files that are corrupted because they have not been processed correctly and they are not playable. so, i can't say why they were done that way, but they were not done correctly and they were not done thoroughly. we are missing information. >> frederick says it's likely due to how they acquired the surveillance video. they have left it up to the school district to define what it is they want to provide the police. i think that probably is a mistake. >> reporter: according to the sherif...

All right, let's begin where we left off. an exclusive investigation into the death of the georgia teenager kendrick johnson whose body was discovered in a rolled up wrestling mat in his high school's gym. we have more on what the surveillance vid crow can tell us about what he died and maybe more importantly, what is missing. >> cnn hired this man to analyze the hundreds of hour s of surveillance from lowndes high school. although he doesn't believe the jumpy video is the result of editing, he says there are other major problems. >> they're not original files. they're not something an investi...

condemnation from fellow republicans. rick santorum says the comments are absurd. the white house is also being drawn into the uproar. i'm wolf blitzer. you're in "the situation room." let's get right to the breaking news, a huge tornado outbreak stretches from alabama to indiana and beyond. millions of americans are under tornado watches. tornado warnings as well. professional storm chasers have been following these twisters all afternoon, providing dramatic images of an unfolding disaster. new tornado reports are coming in literally by the minute. with indiana, kentucky, tennesse...