Abstract: Based on the three-stage split-step scheme, a second-order split-step precise-integration time-domain (SS2-PITD) method is proposed for solving Maxwell's equations, which has a better ...

I will never forget this one day when Kevin was a preschooler. We had an IEP meeting, and one of his proposed math IEP goals was to be able to visualize and identify what 2 of something looks like or ...

Abstract: With the rapid development of online education in recent years, there has been an increasing number of learning platforms that provide students with multi-step questions to cultivate their ...

Learn how to confidently apply Coulomb’s Law using a clear, step-by-step problem-solving method. This tutorial breaks down electric force calculations, charge interactions, units, and common mistakes, ...

Ask the publishers to restore access to 500,000+ books. An icon used to represent a menu that can be toggled by interacting with this icon. A line drawing of the Internet Archive headquarters building ...

OSpark.ai offers a free, all-in-one AI assistant designed to support students, professionals, parents, and creators alike. The platform simplifies work, enhances creativity, and streamlines everyday ...

For the first time, a group of physicists has written down a warp drive concept that does not ask the universe for impossible ...

He works in mysterious ways.

December 28, 2025 • NPR's Ayesha Rascoe plays the puzzle with Mark Karp of Marlboro Township, N.J., and Weekend Edition Puzzlemaster Will Shortz.