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Mysterious stains on St. Louis' Gateway Arch prompted a tricky testing procedure. Please LIKE & SUBSCRIBE if you enjoyed! http://bit.ly/1G7yMhG *More info & videos below* For full episodes, check out http://www.scitechnow.org/ The iconic St. Louis gateway arch, an engineering wonder that towers high above the skyline, is now 50 years old. Discoloration on the stainless steel exterior has building doctors climbing 630 feet up the arch to examine the cause of some of those mysterious stains. Facebook: / scitechnow Twitter: / scitechnow Google+: https://plus.google.com/+scitechnowor... ----------------- “SciTech Now” is a new weekly, half-hour newsmagazine program focusing on “the nexus of new ideas.” Hosted by Hari Sreenivasan, anchor of “PBS NewsHour Weekend” and a senior correspondent for the nightly program, “SciTech Now” tackles topics including technology, scientific discovery and innovation. ----------------- More videos: How big is the universe? • How Big Is The Universe? | Ask A Scientist... Closing the gender gap in tech: • Closing Gender Gap in Tech: Girls Who Code... How traffic lights work: • How Traffic Lights Work | SciTech Now Buzzworthy tech startups: • Buzzworthy Tech Startups With Serial Entre... Changing gaming industry: • The Changing Gaming Industry | SciTech Now