925. 45. Peacock-Villada E, Richardson BA, John-Stewart GC. Post-HAART outcomes in pediatric populations: comparison of resource-limited and developed countries. Pediatrics. 2011;127:e423 41. 46. Sutcliffe CG, van Dijk JH, Bolton C, Persaud D, Moss WJ. Effectiveness of antiretroviral therapy among HIV-infected children in sub-Saharan Africa. Lancet Infect Dis. 2008;8:477 89. 47. Leroy V, Malate...

The preparation of yttrium metal by the reduction of yttrium trifluoride with calcium is described. Alternate methods employing the formation of a low melting Y-Zn or Y-Mg intermediate alloy are evaluated and data on chemical and microscopic purity of the resulting metal are presented.

Andrew Odlyzko’s article “Isaac Newton and the perils of financial South Sea” (Physics Today, July 2020, page 30) is more than just a fascinating read about speculation time. It also, perhaps unintentionally, commentary on society’s assumptions scientists.Why would we expect to excel in speculation? Because his mastery mathematics complex natural systems work at Royal Mint? Perhaps. Furthermore...