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It looks like it works only if you do it right. so it is a really important calf vee ott. they spent $1.5 million paying 8,000 kids in new york city and nothing happened. so you have to be careful how you do it. >> explain how that works. they got drastically different results in different cities and different schools. so what model worked, generally speaking? >> the model that worked the best was in dallas. it was a very simple, elegant scheme. they paid second graders $2 for every book they read once they passed a computerized quiz on the book to make sure they read it. it was cheap as dirt,...

clear and made a mad bash back inside. yesterday they got within 500 feet but forced to turn back because of dangerous gas levels and fears of possibly another explosion. one of two injured miners who survived has been released by the hospital. the ap reports he's not talking to anyone this morning. give us a sense of how optimistic they are as they get set to go back into the mine and look for the four missing mine re rers. >> reporter: they are still hopeful. keep in mind we're at hour 6 since the fatal blast in naoma, west virginia. these men should have made it by this point to t...