Explore some favorite visual stories of designers, developers and art directors from The Washington Post’s Design, Graphics and Opinions teams.

Abstract: Frequency Modulated (FM) signals are usually characterized by two or more components having different waveforms and time-dependent frequencies. The estimation of the instantaneous frequency ...

Background Heart auscultation is a widely used and cost-effective clinical tool for detecting valvular heart disease (VHD), particularly in primary care. However, existing evidence on its diagnostic ...

An all-in-one Capture The Flag Challenges solving tool written in Python that combines various utilities commonly needed in CTF challenges. This tool provides a modern, user-friendly GUI interface for ...

Audacity is a free, open-source digital audio editor and recording software. It provides users with powerful tools for recording, editing, and enhancing audio ...

Abstract: Joint time-frequency representations (JTFRs), such as the spectrogram, provide key information about the spectral evolution of a system. This is essential for instance to analyze ...

Jennifer Simonson is a business journalist with a decade of experience covering entrepreneurship and small business. Drawing on her background as a founder of multiple startups, she writes for Forbes ...

The U.S. stock market has performed admirably so far in 2025. Stocks, as measured by the S&P 500, have appreciated more than 10% as of Sept. 4. The Dow Jones Industrial Average and the Nasdaq have ...