But what does that mean? The simple answer is how heavy something is for its size. If something seems very heavy for its size (like a heavy metal object), we say it is more dense. If something seems ...

Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...

How gravity causes a perfectly spherical ball to roll down an inclined plane is part of elementary school physics canon. But the world is messier than a textbook. Scientists have sought to ...

Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...

Laura Schober is a writer and editor specializing in health, food, wellness, beauty, and lifestyle content. Laura is also a seasoned communications professional who has previously worked in the ...

Stephanie Sheir received funding from the EPSRC (grant number EP/V026518/1). Timo Istace receives funding from Fonds Wetenschappelijk Onderzoek Vlaanderen. Nicholas J. Kelley does not work for, ...