Mars Slopes Stained With Salty Water?

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Signs of Salty Water Stain Slopes on Mars         Dark streaks that have been observed on Mars are becoming the best evidence yet that water exists on Mars in liquid form today. Read More WATCH VIDEO: Water Found on Mars ... FOR REAL! Does the discovery of water on Mars mean life once existed on the Red Planet? Why Pointed Skulls Prompt Alien Theories         Strange, elongated skulls found in South America are spawning theories about unknown humans and aliens. But why? Read More WATCH VIDEO: Do Aliens Really Exist? Let's check out the evidence and run the numbers: Are other life forms out there? Why Did Zoo Kill Giraffe Instead of Sterilizing It?         Marius the giraffe's genetics doomed him, because he wouldn't make a good stud. Read More WATCH VIDEO: Cool Jobs: Giraffe Keeper Get a look at what it's like to take care of our planet's tallest land-living animal. Auroras Are So Pretty Let's Shoot Them! Video         DNews discusses why we should shoot rockets at auroras ... for science! Watch Follow Discovery News on Facebook! Get your sci-tech headlines all day on Twitter too! Follow us @Discovery_News. At Discovery we value your privacy. If you would like to be removed from Discovery News emails like this, please click here to our subscription center, where you can manage your account. We recently updated our privacy policy. This policy is effective as of 10/30/07. To see new policy click here . Discovery Communications, LLC One Discovery Place Silver Spring, MD 20910 © 2013 Discovery Communications, LLC