A decade ago, building a working firearm at home required machining skills, welding experience and specialized tools.

For more than a century, physicists debated which way a submerged sprinkler sucking in water would spin. Careful experiments ...

A school year’s worth of short, accessible image-driven posts that invite a variety of kinds of writing By The Learning Network To participate, submit your response here by July 17 at 9 a.m. Eastern.