An unknot (also known as the trivial knot) can be drawn with any number of crossings. Any possible manipulation of a knot diagram that does not fundamentally change the knot can be achieved by a ...

Size is important, but the correct size for the TV-frequency band is most important. The simplest antenna is a half-wave dipole, and when looking at any antenna—transmit or receive—you should see ...

The blue Goodwill sign beckons like a lighthouse guiding bargain-seekers to safe harbor from the stormy seas of full-price retail. Behind those unassuming glass doors lies a universe where $25 ...

The hidden funders of early Eureka Gold eagle coins worth $10, double eagles worth $20 and various paper bills piled so high on the courtroom table that an officer was assigned to guard them. The ...

That’s the Goodwill Outlet Store on Patton Avenue in Asheville, North Carolina – a bargain hunter’s paradise that draws thrifting enthusiasts from across the state.

The bold question-askers at What If explore what building a full-scale model of the periodic table would reveal.

Everything around us is built from sets of chemical elements. From the air we breathe to the jewelry we wear. All of these elements can be found on the periodic table that we’ve all had a chance to ...

New studies of the “platypus of materials” help explain how their atoms arrange themselves into orderly, but nonrepeating, patterns.

The periodic table word search has become one of those go-to printables I keep on hand whenever we’re learning about chemistry. It’s simple, fun, and surprisingly effective at helping kids remember ...

Atoms are the building blocks of everything. Atoms can form strong bonds with each other, making molecules. Symbols and formulae Letters from the alphabet are used to represent chemical elements. An ...

How do we calculate mass and atomic numbers? VideoHow do we calculate mass and atomic numbers? This video is an interactive lesson in calculating an atom's mass and atomic number.