PDF files have become ubiquitous in our multi-platform world. This convenient file format makes it possible to view and share documents across various devices using various operating systems and ...

Since the identification in 1991 of repeat instability as a disease-causing mutation, gene-specific repeat instability is now known to be the mutational cause of at least 40 neurological, ...

Priority Mail and Priority Mail Express stamp designs will celebrate American space exploration with dazzling images taken from NASA’s James Webb telescope. As stamp collecting remains a tradition for ...

Several new stamps will be available next year, along with dedication ceremonies for a select few. The United States Postal Service (USPS) announced 19 stamp designs to be unveiled in 2026 back in ...

Nonlinear dynamics is the branch of physics that studies systems governed by equations more complex than the linear, aX+b form. Nonlinear systems, such as the weather or neurons, often appear chaotic, ...