The U.S. has always carried national debt, and the majority of presidents have added to it. However, total national debt has been expanding rapidly since 2008 due to a combination of increased ...

Mammal's Lifespans Linked to Brain Size and Immune System Function, Says New Study May 8, 2025 — Why do cats generally live longer than dogs? New research suggests that longer lifespans of ...

Correspondence to Professor Peter B O'Sullivan, School of Physiotherapy and Exercise Science, Curtin University, Perth, WA 6102, Australia; p.osullivan{at}curtin.edu.au If you wish to reuse any or all ...

Like all theories, rational choice theory may explain collective behavior. Rational choice theory ... humans operate as rational actors. Thaler’s idea of mental accounting shows how people ...