Carla Tardi is a technical editor and digital content producer with 25+ years of experience at top-tier investment banks and money-management firms. Robert Kelly is managing director of XTS Energy LLC ...

You can use apostrophes to show that you have omitted (left out) some letters when you are joining words together. For example, you can join the words ‘you’ and ‘are’ together. You + are = you're. The ...

If you want a fun car but you don't want to blow a ton of money on fuel, you're spoiled for choice right now. Here are genuinely fun cars that'll get 30 mpg or better on the highway, as certified by ...

Lower back spasms are involuntary contractions or tensing of the muscles in the lower back, and they may affect movement. Doctors may recommend medications, lifestyle changes, and complementary ...

Inside: Christmas Pokey Pin for Kids If you’re looking for a calm, hands-on activity that helps preschoolers strengthen their ...

Christmas is almost here! Whatever plans you've got on the calendar to mark the occasion, you might be looking for some new ways to celebrate with loved ones. If that's the case, we've got a ...

Labor contractions can feel like intense cramps or pressure. Braxton-Hicks contractions do not follow a pattern and may stop with activity. Early labor contractions become more regular and stronger ...

Abstract: We introduce the concept of a control contraction metric, extending contraction analysis to constructive nonlinear control design. We derive sufficient conditions for exponential ...

Abstract: In this article, we examine the role of differential positivity in the contraction analysis of discrete-time nonlinear systems with parameters that follow stochastic processes. We ...