Scientific American - USA (2020-03)

March 2020, ScientificAmerican.com 57 were the second- and third-order crises. What do you do when a person requires more care t ...

58 Scientific American, March 2020 cases are caused by mutations in PRNP, the gene that encodes PrP. For reasons we do not fully ...

March 2020, ScientificAmerican.com 59 proach, sometimes dubbed “secondary prevention,” recruits cognitively healthy people in wh ...

60 Scientific American, March 2020 WHAT IS KILLING THE MONARCHS? © 2020 Scientific American ...

WHAT IS KILLING THE MONARCHS? It seemed simple: Roundup herbicide was destroying America’s favorite butterfly. But new evidence ...

62 Scientific American, March 2020 PRECEDING PAGES: INGO ARNDT Nature Picture Library Nearly the entire monarch population was c ...

March 2020, ScientificAmerican.com 63 INGO ARNDT Nature Picture Library (^1 ); DOUG WECHSLER Nature Picture Library (^2 ) recent ...

64 Scientific American, March 2020 monarch populations had fallen steeply. In fact, during the win­ ter of 2009­2010 the occupie ...

March 2020, ScientificAmerican.com 65 Egg 3–5 days Larvae/caterpillar 9–14 days Chrysalis 8–13 days Population Index (hectares) ...

66 Scientific American, March 2020 NATIONAL GEOGRAPHIC IMAGE COLLECTION terfly originally fed. Flockhart concluded that the Midw ...

March 2020, ScientificAmerican.com 67 even won over—partly—Oberhauser, the original milkweed­loss proponent. “I was probably bei ...

68 Scientific American, March 2020 FIGURATIVE IMAGERY found in a cave in Indonesia has been dated to 43,900 years ago, which is ...

ARCHAEOLOGY A cave painting from Sulawesi is the oldest known example of narrative art By Kate Wong The First Story March 2020, ...

70 Scientific American, March 2020 PRECEDING PAGES: ADHI AGUS OKTAVIANA Archaeologists have eagerly sought the origins of our di ...

March 2020, ScientificAmerican.com 71 record holder for oldest figurative artwork— a 40,000-year-old painting of a cowlike anima ...

72 Scientific American, March 2020 3 to climb up vines or perhaps bamboo poles—or, in some cases, pick their way through the net ...

March 2020, ScientificAmerican.com 73 vealed through the material culture preserved in the archaeological record—coalesced rathe ...

74 Scientific American, March 2020 © 2020 Scientific American © 2020 Scientific American ...

March 2020, ScientificAmerican.com 75 Our concepts of how the two and a half pounds of flabby flesh between our ears accomplish ...

76 Scientific American, March 2020 are recalling last night’s conversation with dinner guests or using an acquired skill such as ...