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 ...

May 21, 2025 — The smallest grooves on the brain's surface, unique to humans, have largely been ignored by anatomists, but recent studies show that they're related to cognitive performance ...

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 ...