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Go to search Go to header Go to navigation Go to main content Go to footer Sign In Sign In Sign in with Athens Search Library Collections Sign Out Sign Out Cancel Sign In Toggle navigation Sign In Home Articles Briefings News Biographies Media Projects For Faculty For Admins Free core content to support distance learning Award-winning experts contribute to AccessScience STEM insights, from atomic nuclei to the human brain 8500+ articles covering all major scientific disciplines Interested in subscribing to AccessScience? Learn more and request a free trial. Contact Us Topics Agriculture, Forestry & Soils Anthropology & Archeology Astronomy & Space Science Biology & Biomedicine Botany Chemistry Computing & Information Technology Earth Science Engineering & Materials Environmental Science Food Science & Technology Health Sciences Mathematics Military Science Navigation Paleontology Physics Psychiatry & Psychology Science Theory & Philosophy Zoology Browse by Topic Browse Articles:ABCDEFGHIJKLMNOPQRSTUVWXYZ# Editors’ Picks Explore idea one Nice try, butterfly: Predators have evolved resistance to the plant toxins monarchs eat to avoid predation.More Briefings Explore idea two Machine learning: This newly updated article has an in-depth discussion on how machines learn.More Articles in Computing Explore idea three Cornelia Bargmann: Her pioneering work on roundworms led to major discoveries in neurobiology.More Video Biographies Explore idea four Coronavirus: This major group of animal viruses can cause SARS, MERS, and the common cold.More Articles in Infectious Diseases Popular This WeekMammalia Global climate change Evolution AnalgesicNuclear magnetic resonance (NMR)Do You Know?Why is volcanic ash especially hazardous for airplanes? Reveal answer Volcanic ash clouds are not detectable by an aircraft’s onboard radar instrumentation. The ash can get into a plane’s engine and potentially cause power loss. See: Volcanology AccessScience About Articles Briefings Biographies Media Projects New & Noteworthy Help/FAQ For Faculty For Admins Get AccessScience Contact Us Troubleshooter Page Subscribe Connect Copyright © McGraw-Hill Global Education Holdings, LLC. All rights reserved. Privacy Notice. Any use is subject to the Terms of Use. Additional credits and copyright information. Accessibility policy. Your IP information is 103.127.124.163 / 103.127.124.163 A Scolaris platform, built by: // For Enabling the HTML-CSS for overline