Scientific American - 09.2019

September 2019, ScientificAmerican.com 19 FROM “MAPPING HIV PREVALENCE IN SUB-SAHARAN AFRICA BETWEEN 2000 AND 2017,” BY LAURA DW ...

20 Scientific American, September 2019 RICHA BATRA, JANE NISSELSON AND KYLE PARSONS Columbia Engineering ADVANCES TECH Robot Her ...

September 2019, ScientificAmerican.com 21 HUGH MACKINTOSH Getty Images ANIMAL BEHAVIOR Fast-Flapping Friends 0žx ̧³ä‹āî ̧xîš ...

22 Scientific American, September 2019 THE SCIENCE OF HEALTH Claudia Wallis is an award-winning science journalist whose work ha ...

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24 Scientific American, September 2019 VENTURES THE BUSINESS OF INNOVATION Wade Roush is the host and producer of Soonish, a pod ...

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26 Scientific American, September 2019 & ...

September 2019, ScientificAmerican.com 27 TRUTH LIES & UN CERTAINTY On July 8 President Donald Trump stood in the East Room ...

TRUTH PART 1: 28 Scientific American, September 20 19 ...

TRUTH & UNCERTAINTY LIES VIRTUALLY REALITY By George Musser NUMBERS GAME By Kelsey Houston-Edwards OUR INNER UNIVERSES By An ...

30 Scientific American, September 2019 Illustration by Brook VanDevelder VIRTUALLY REALITY HOW CLOSE CAN PHYSICS BRING US TO A T ...

September 2019, ScientificAmerican.com 31 ...

32 Scientific American, September 2019 A bench scientist faces more concrete problems. Is a wire broken? Is the code buggy? Is t ...

Illustration by Bud Cook September 2019, ScientificAmerican.com 33 sible. The mathematics of quantum theory jumbles together sub ...

34 Scientific American, September 2019 electric or magnetic field. Yet their theories indicate that no such things can exist. Th ...

September 2019, ScientificAmerican.com 35 perceive the world as divided into objects situated within space and time, not nec ess ...

36 Scientific American, September 2019 ...

Illustration by Brook VanDevelder September 2019, ScientificAmerican.com 37 whose definition and properties are flexible. The ac ...

38 Scientific American, September 2019 Illustration by Bud Cook Throughout the 20th century mathematicians de- bated whether Zer ...