document.write('');PubMatic.pmAdInfo.setNetworkId('0',243,22776,1.414345,1.646840,'',0.000000,'F919C601-347C-4654-83D2-B1BFC24C4C10');var str = '%3Cscript%20src%3D%22https%3A%2F%2Fnym1-ib.adnxs.com%2Fab%3Fan_audit%3D0%26referrer%3Dscientificamerican.com%26e%3DwqT_3QLKDvD9SgcAAAMA1gAFAQiS6LyQBhDTn5ixk-7X0S8YiPLt--2ugdpGKjYJZGkIdlXQ_T8RWkxs5nRZ-j8ZAAAAYGZmAEAhS-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-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-EElGSUVEAT4cFQoIU1BMSVQBTRnZ8IaAAwCIAwGQAwCYAxSgAwGqAwDAA6wCyAMA2AOdwQbgAwDoAwD4AwOABACSBAkvb3BlbnJ0YjKYBACiBA01NC4xNzUuMTE5LjkyqAQAsgQMCAAQABgAIAAwADgAuAQAwAQAyAQA0gQNNjY4I05ZTTI6NDU1ONoEAggB4AQA8ATAiuudAfoEEgmhwFTXg0NAEQAAACBcX1PAiAUBmAUAoAX_EQGwAaoFJDQ1N0YzNUFGLTYzOTktNDJDQS05RDc0LUY1QzJERkQ1NzI0OMAFAMkFAU8cAADwP9IFCQkJDHgAANgFAeAFAfAFxrcD-gUECAAQAJAGAJgGALgGAMEGCSUo8D_QBtYB2gYWChAJERkBXBAAGADgBgHyBgIIAIAHAYgHAKAHAboHDwFIDfEs_B5AAMgH8N0C0gcNFXYBOAjaBwYJJ_BW4AcA6gcCCADwB_uf3wOKCEYKQgAAAX8LY2ZQL6NfcTYmD9NjdvGS1eVmShWeh6vk-bP8PS2iMzqYFqmUE9OGKzqVMHpy5Qjv5M0nRJhuGa96AjMHnRAB%26s%3D4d66468e69669d6edb73ac855cabf5b3ecb56bdf%26pp%3D1.646840%22%3E%3C%2Fscript%3E'; document.writeln(decodeURIComponent(str)); document.write('');document.write(''); document.write(' ');/* ADSVA003:D893F90B-7B32-48C0-A763-7EFBADC2B15C *//* etsdiff:166231 *//* u_ts:2022-2-18%205%3A52%3A18, u_tz:0 *///