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Watch the beginning of Venus’s transit across the disk of the sun, one of the rarest astronomical events. Watch the conclusion of Venus’s 6.5-hour journey across the disk of the sun, one of the rarest astronomical events. Join Dr. Russell Schnell, the director of the Global Monitoring Division of the National Oceanic and Atmospheric Administration (NOAA), as he talks about what it takes to monitor climate change. Learn about NOAA’s Mauna Loa Observatory on the Big Island of Hawaii, the location of the Exploratorium’s June 5, 2012, webcast of the transit of Venus. A leading atmospheric research facility, the observatory has been collecting and monitoring data relating to atmospheric change since the 1950s. Dr John Barnes, the Station Chief for the observatory, describes the functions of the MLO, which provides valuable long-term and continuous recording of data. Dr. John Barnes, Station Manager of NOAA's Mauna Loa Observatory, shares the history of Charles Keeling's pioneering carbon dioxide measurements, which have been taken continually at Mauna Loa since 1958. In this video from NASA's Jet Propulsion Laboratory, we examine the notion of curiosity. Curiosity is a big part of what it means to be human. It's also the name of NASA's next Mars rover. This 60-second video shows how one type of curiosity can inspire another. In this video from NASA's Jet Propulsion Laboratory, we look at landing on Mars. Landing a spacecraft on Mars is one of the trickiest things we do. This 60-second video explains how it’s done, and the three landing systems we use at the Red Planet. In this video from NASA's Jet Propulsion Laboratory, an animation shows the major mission events of the Curiosity rover's landing on Mars. In May of 2012, Tibetan monks and nuns visited the Exploratorium with their exhibition "The World of Your Senses." Master Painter Jampa Choedak created a painting using thangka techniques while in residence. Virtual worlds have physics. In this exhibit a visitor knocks over a small domino which knocks over a larger domino and so on down an exponentially growing line of dominoes which all the while obey the laws of physics.