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Element is liquid water, a lot of it. correspondent kristin fisher is here with details. >> we are talking about a lake of liquid water on mars right now. if the findings are confirmed, this is the discovery so many scientists have been waiting for, a specific place to target in their search for microbial alien life. the discovery was made not by nasa but the italian space agency using one of the oldest spacecrafts still operational in orbit around mars, the mars express. they used ice penetrating radar to bounce radio waves off the surface of mars and when they got to the planet southwold the...

Ed: we have not heard that all we heard is that they were exchanging letters. ainsley: i bet cell phones don't work. pete: that's what we talked about is communication. you are not getting a signal two and a half miles inside a cave to get out. also, how do divers communicate with each other when radio waves only travel a couple hundreds meter under water. hand signals, audio. passing information from diver to diver back to the front of the kaye and back to the cave. maybe they have cable communication in there at this point because they did have an oxygen line put. in because oxygen was a big...

Radar looking for bodies at a home where they have already found three. the arrest of this man, stewart weldon, led them to the property. he remains behind bars as police fear there could be more victims. here's erielle reshef. >> reporter: tonight, an intense search under way using ground-penetrating radar after the gruesome discovery of three bodies at this massachusetts home. >> we're looking for objects underneath the surface. radio waves will kick back and indicate to us whether there's an object there. it can also detect disturbed earth, which would indicate any kind of excavation. >> re...

Century contract photons some examine visible or infrared light as well as long wave radiation such as radio waves or short wave radiation such as x. rays the but for all their sophistication none of these telescopes can detect cosmic radiation. to detect these elusive particles scientists need additional options using the very latest technology and developing new approaches to astronomy. to. mendoza province in western argentina next to the andes mountains is home to the pier the observatory the largest for. city of its kind in the world. the site

Don't have any evidence. and they are continuing to rule out the harm to our diplomats in havana. >> if it is not a sonic attack, if we don't know if cuba is behind this, there's no evidence, what else is there? >> reporter: well, it's the million-dollar question, but there are a lot of theories investigators have looked at, including other types of energy waves, such as microwaves, radio waves, toxins that could be in the environment, and other types of bizarre advanced scientific methods to use to harm someone. >> josh, sabrina and ash she le onset. i want to talk about arizona jeff flake wh...