National security, unlocked. Each Thursday, host Mary Louise Kelly and a team of NPR correspondents discuss the biggest national security news of the week. With decades of reporting from battlefields ...

Statistical methods are mathematical formulas, models, and techniques that are used in statistical analysis of raw research data. The application of statistical methods extracts information from ...

MELBOURNE, Australia (AP) — Novak Djokovic had the big stage and a list of milestones that he needed to celebrate with his 100th win at the Australian Open. He delivered the kind of performance that ...

Self-employment tax is a mix of Social Security and Medicare taxes. Use our calculator to estimate what you owe. Many, or all, of the products featured on this page are from our advertising partners ...

Molecular dynamics is a method that uses Newton’s equations of motion to computationally simulate the time evolution of a set of interacting atoms. Such techniques are dependent on a description of ...