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Can you count all the triangles in these images? (Hint: There are more than you think.); These polygons contain multitudes.

• Authors : By:Eleanor Cummins

• Source: Popular Science, May 17, 2020 Science, 1pp

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out of thin air.

• Authors : Watson, Sarah Kiley

• Source: Popular Science. Summer, 2019, Vol. 291 Issue 2, p119, 1 p.

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Build a low-cost shade plotter.

• Authors : Free, John

Subjects: PLOTTING charts; ARCHITECTS; COMPASS (Orienteering & navigation)MILSTEIN, Jeffrey

• Source: Popular Science; Feb82, Vol. 220 Issue 2, p120-120, 1p

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CALCU-PUZZLES.

Subjects: CALCULATORS; DISTANCES; RADIUS (Geometry)

• Source: Popular Science; May82, Vol. 220 Issue 5, p70-70, 1/3p

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This mysterious ancient tablet could teach us a thing or two about math; Some researchers say the Babylonians invented trigonometry—and did it better.

• Authors : By:Rachel Feltman

• Source: Popular Science, August 25, 2017 Science, 4pp

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Autoloop

• Authors : By:unknown; Dave Mosher

• Source: Popular Science, November 1, 2013 How 2.0 US EDITION, p. 67 2pp

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Vampire bats rendezvous with their friends when dining out

• Authors : By:Elana Spivack

• Source: Popular Science, September 28, 2021 Animals, 4pp

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THE FLOPPY-DISK LAPTOP DISK.

Subjects: FUJII, Gary; TABLE (Furniture) design & construction; FLOPPY disks

• Source: Popular Science. Mar2009, Vol. 274 Issue 3, p77-77. 1/6p.

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The Sun Stove.

• Authors : LEAVY, THOM

Subjects: SOLAR ovens; SPELLMAN, Brandon

• Source: Popular Science. Jan/Feb2017, Vol. 289 Issue 1, p88-88. 1/2p. 1 Color Photograph.

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Rotating Centerpiece.

Subjects: DO-it-yourself work; CENTERPIECES -- Design & construction

• Source: Popular Science; 1990 Yearbook, p94-98, 5p

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