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STEM might have - at least - two meanings:
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Science, technology, engineering, and mathematics (STEM) is an umbrella term used to group together the distinct but related technical disciplines of science, technology, engineering, and mathematics. The term is typically used in the context of education policy or curriculum choices in schools. It has implications for workforce development, national security concerns (as a shortage of STEM-educated citizens can reduce effectiveness in this area), and immigration policy, with regard to admitting foreign students and tech workers.
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Scanning transmission electron microscopy (STEM) combines the principles of scanning electron microscopy and transmission electron microscopy. In STEM, a finely focused electron beam is scanned across a very thin sample, allowing for the collection of various signals in parallel. This technique is particularly useful for obtaining high-resolution images and spectroscopic data, making it a powerful tool in materials science, nanotechnology, and biology.
Both texts from Wikipedia
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