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security peiter zatko, alleging the social media giant's leadership misled its own board, and government regulators about security vulnerabilities that could potentially open the door for foreign spying, hacking and disinformation campaigns. those are stunning, serious claims sent to congress and several federal agencies last month. our very own cnn correspondent donie o'sullivan sat down with him to talk about this. here's the story. >> reporter: ready? >> yes. >> reporter: why are you coming forward? >> all my life i've been about finding places where i can go, and make a differenc...

Something else was being exposed. dinosaur prints. dinosaur prints. these are not recent. these are 113 million years old. in dinosaur valley, an hour southwest of fort worth. and so they know that these were here. there is a state park there. with the water being so low, they were able to find more. they found an herbivore, plant eater, and found a similar relative to a t-rex, a meat eater. so we don't know which one won, but i have a pretty good idea. >> wow. that's remarkable. extremely well preserved. >> yes, it is a stone. it is limestone. this isn't like mud or silt, this is going to be ...

Loose. question three, another multiple-choice. scientists just announced a major discovery overseas. footprints belonging to massive extinct dinosaurs, some as long as 50 feet, were found in rich country? a, scotland. b, spain. c, sweden. >>tl scotland. >> tucker: scotland? you don't think it would be sweet and? let's find out where that was pretty certain. >> signed signed to say they discovereded dinosaur prints, footprints in scotland, found dozens of them that belonged to the largest animal to ever roam the earth. 49 feet long, 10 tons in weight. >> a fan of beer. >> tucker: i am impresse...