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Third missile test this month. let's get more. cnn's will ripley is in taipei. explain to viewers what is exactly a hypersonic missile and how worried, if they're worried at all, is the region to news that north korea has this technology and is testing it? >> reporter: hi, isa. both very good questions. because a lot of us haven't really heard of hypersonic missiles because they're actually pretty rare. only two countries right now are known to have them deployed. that would be china and russia. the united states is also developing and testing hypersonic missile technology. hypersonic by def...

For every body movements it has to be super precise. >> reporter: with speed climbing, the route is always the same and it is fast. athletes bolt up a 15-meter wall in less than ten seconds. >> the route is used internationally, like it is a set course that's been used for years now. so every time you get on the speed wall it is the exact same route, so people have been able to put up phenomenal times just by training on the wall every day. >> reporter: for lead climbing and bouldering the courses are random. >> for each comp anything is different with climbing. that's what makes the sport so ...

A helicopter on its deck, giving it even less maneuverability than usual. >> you have to be on a set course and a set speed so that the winds across the deck are safe for the helicopter to land. >> reporter: boxed in, the captain performs an emergency maneuver, called an all engines back full. >> you're basically throwing that ship into reverse while it's moving forward at 15 to 18 miles an hour would be my guess. it's 10,000 tons of metal moving through the water. it's not going to stop quickly. and as the ship reacts to that order, as the propellers shift direction, the whole ship is going t...

Other. the u.s. navy is saying photographic evidence proves it was the russians who were at fault. >> reporter: a brazen challenge. this russian destroyer according to the u.s. navy coming within 100 feet of the "uss chancellorsville," american sailors recording the potentially deadly provocation but the russian military. taking place in the philippine sea south of okinawa. the russian action came as the u.s. cruiser was trying to land a helicopter on its deck, giving it even less maneuverability than usual. >> you have to be on a set course and set speed so that the winds across the deck are ...