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April 2020, ScientificAmerican.com 33 XING ­WU ZHENG AND MARK J. REID, BAR AND SPIRAL STRUCTURE LEGACY (BESSEL) SURVEY (A VLBA K ...

34 Scientific American, April 2020 Illustration by Elena Hartley that far surpasses that of any other current telescope at any w ...

April 2020, ScientificAmerican.com 35 Local spur, suggesting a minor structure similar to smaller append- ages seen branching of ...

36 Scientific American, April 2020 ENDANGERED Key Largo woodrat has suffered from habitat loss, hurricanes, pythons—and cats. © ...

WOODRAT April 2020, ScientificAmerican.com 37 I N B R I E F Worldwide, feral cats kill a signifi­ cant amount of wildlife every ...

38 Scientific American, April 2020 PRECEDING PAGES: JOEL SARTORE; THIS PAGE: MICHAEL COVE North Carolina State University AND US ...

April 2020, ScientificAmerican.com 39 sible to restrict them all to the 2,500-acre property. Over several weeks in 2010 and 2011 ...

40 Scientific American, April 2020 SOURCE: “DECREASE IN POPULATION AND INCREASE IN WELFARE OF COMMUNITY CATS IN A TWENTY ­THREE ...

April 2020, ScientificAmerican.com 41 owners filed a never-ending stream of complaints about the noise of cat fights and the sme ...

42 Scientific American, April 2020 life refuge, he learned that the cats almost exclusive- ly ate food provided by humans, inclu ...

April 2020, ScientificAmerican.com 43 MICHAEL COVE North Carolina State University AND USFWS tion could help protect the beleagu ...

44 Scientific American, April 2020 © 2020 Scientific American ...

April 2020, ScientificAmerican.com 45 ADAM VOORHES Gallery Stock I sat at an oral surgeon’s offIce waiting for my daughter. The ...

46 Scientific American, April 2020 Indeed, the teeth of modern-day humans are a profound con- tradiction. They are the hardest p ...

April 2020, ScientificAmerican.com 47 the level needed for chewing. Whether the prisms evolved once or several times independent ...

48 Scientific American, April 2020 kept in check by their commensal cousins, the mitis and sangui- nis streptococcal groups. The ...

April 2020, ScientificAmerican.com 49 C-DENTAL X–RAY, INC. The famed Australian orthodontist “Tick” Begg recognized this mismatc ...

50 Scientific American, April 2020 Photographs by Igor Siwanowicz extreme TULLBERGIA, smaller than a sesame seed, uses its two f ...

extreme survıvor A tiny, six-legged animal has persevered through more than 30 ice ages in the harshest badlands of Antarctica. ...

52 Scientific American, April 2020 BYRON ADAMS ( 1 and 2 ) I an Hogg and Byron adams peered out tHe windows of tHeir helicopter ...