Template:Are You Sure/January 20: Difference between revisions
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• ... that '''[[SCORE (satellite) (nonfiction)|Project SCORE]]''' (Signal Communications by Orbiting Relay Equipment) was the world’s first communications satellite, as well as the first successful use of the Atlas rocket as a launch vehicle?<br> | [[File:Archimedes method of exhaustion compute area inside circle.svg|thumb|175px|link=Mathematical analysis (nonfiction)|[[Archimedes (nonfiction)|Archimedes]] used the method of exhaustion to compute the area inside a circle by finding the area of regular polygons with more and more sides. This was an early but informal example of a [[Limit (nonfiction)|limit]], one of the most basic concepts in mathematical analysis.]]• ... that '''[[SCORE (satellite) (nonfiction)|Project SCORE]]''' (Signal Communications by Orbiting Relay Equipment) was the world’s first communications satellite, as well as the first successful use of the Atlas rocket as a launch vehicle?<br> | ||
• ... that electrical engineer '''[[Elisha Gray (nonfiction)|Elisha Gray]]''' invented a harmonic telegraph which transmitted multiple tones simultaneously, and that each tone was controlled by a separate telegraph key?<br> | • ... that electrical engineer '''[[Elisha Gray (nonfiction)|Elisha Gray]]''' invented a harmonic telegraph which transmitted multiple tones simultaneously, and that each tone was controlled by a separate telegraph key?<br> | ||
• ... that physicist '''[[David Brewster (nonfiction)|David Brewster]]''' discovered the photoelastic effect while studying double refraction by compression, inaugurating the field of optical mineralogy? | • ... that physicist '''[[David Brewster (nonfiction)|David Brewster]]''' discovered the photoelastic effect while studying double refraction by compression, inaugurating the field of optical mineralogy? | ||
Revision as of 19:48, 20 January 2020
Archimedes used the method of exhaustion to compute the area inside a circle by finding the area of regular polygons with more and more sides. This was an early but informal example of a limit, one of the most basic concepts in mathematical analysis.
• ... that Project SCORE (Signal Communications by Orbiting Relay Equipment) was the world’s first communications satellite, as well as the first successful use of the Atlas rocket as a launch vehicle?
• ... that electrical engineer Elisha Gray invented a harmonic telegraph which transmitted multiple tones simultaneously, and that each tone was controlled by a separate telegraph key?
• ... that physicist David Brewster discovered the photoelastic effect while studying double refraction by compression, inaugurating the field of optical mineralogy?