Abstract: This article provides a tutorial introduction to disk margins. These are robust stability measures that account for simuitaneous gain and phase perturbations in a feedback system. The ...

Astronomers want to collect as much data as possible using as many systems as possible. Sometimes that requires coordination between instruments. The teams that run the James Webb Space Telescope ...

The FBI says it's examining ransom notes sent to the media as the search for Nancy Guthrie, the mother of 'Today' show host Savannah Guthrie, enters its sixth day. The FBI has confirmed the existence ...

It has now been five days since law enforcement began searching for Nancy Guthrie. She's the mother of "Today" show host Savannah Guthrie. The 84-year-old was reported missing on Sunday from her home ...

For more on Tuesday’s vote to end the partial government shutdown and the latest on the Justice Department’s release of the Epstein files, Geoff Bennett speaks with House Minority Leader Hakeem ...

This story was originally published by The 19th. In the months leading up to his election, President Donald Trump insisted that he had nothing to do with the far-right vision for his second ...

Can you chip in? This year we’ve reached an extraordinary milestone: 1 trillion web pages preserved on the Wayback Machine. This makes us the largest public repository of internet history ever ...

An illustration of a magnifying glass. An illustration of a magnifying glass.

ANTHONY, KAN. — Kevin Patterson stepped through a door when he began preaching in August 1995. An accounting graduate from Abilene Christian University in Texas, Patterson left his life as a bank ...

With the right backing bio-based technologies, like the conversion of food waste into fuel, could reduce the world’s reliance on fossil fuels, lowering greenhouse gas emissions and helping countries ...

This piece first ran as part of The Countdown, our daily newsletter rounding up all the developments in the New York City mayor’s race. Sign up here to get it in your inbox. There are 15 days to the ...

Numerous natural supplements are promoted for treating osteoarthritis (OA), from glucosamine and chondroitin to curcumin. Some are better than others at easing pain and stiffness. Check with your ...