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]]> Sat, 23 Sep 2023 05:00:00 GMT https://encyclopedia.thefreedictionary.com/Prometheus+(tree) //encyclopedia.thefreedictionary.com/Prometheus+(tree)#2023 In 1964, Prometheus, a Great Basin Bristlecone Pine, was the oldest known non-clonal organism on Earth. That year, a graduate student cut down the 5,000- year-old tree to examine its ring growth patterns and derive information about the climate. It is unclear who suggested that Prometheus be cut down, why the action was deemed necessary, and whether its impact was fully understood at the time. Methuselah is currently the oldest known living tree. How old is it?
]]> Fri, 22 Sep 2023 05:00:00 GMT https://encyclopedia.thefreedictionary.com/O+ring //encyclopedia.thefreedictionary.com/O+ring#2023 An o-ring is a rubber ring that is used in machinery as a seal against substances like oil and air. Although it is one of the most commonly used seals, it is forever linked to a catastrophic failure. After the space shuttle Challenger exploded in 1986, investigators determined that the o-ring seal in one of the shuttle's solid fuel rockets failed due to a loss of elasticity that resulted from the low temperature at launch time. How was this problem later demonstrated at a news conference?
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