Bohr proposed adding to the model the new idea of quanta put forth by Max Planck in 1901. That way, electrons existed at set levels of energy, that is, at fixed distances from the nucleus.

Two years later, Enrico Fermi bombarded uranium with neutrons ... introducing the term "nuclear fission." Using Bohr's liquid drop model of the nucleus, they suggested that when split, both ...

More affordable than ever, 3D printers are booming for personal, professional, and educational use. Here's everything to know before you buy one, along with the top models from our hands-on testing.

If you’re moving beyond foam board wings, 3D printing is an excellent way to create an accurate airfoil, and [Tom Stanton] provides us with an excellent guide to modeling wing sections for easy ...

Whether you're brand new to 3D printing or have been wanting to invest in your own printer for a while, these machines are not as expensive as you might think. Whether you want to prioritize print ...

While his main areas of expertise are maker tools -- 3D printers, vinyl cutters, paper printers, and laser cutters -- he also loves to play board games and tabletop RPGs. Expertise 3D printers ...

Faces - A face is a flat surface on a 3D shape. For example a cube has 6 faces. Edges - An edge is where two faces meet. For example a cube has 12 edges. Vertices - A vertex is a corner where ...

If you've ever wanted to showcase your love for Toronto in your home, you can now print a meticulously designed 3D model of the city for free. The elaborate model, which comes in a variety of ...

The best 3D printers let you make all sorts of interesting things, from small parts to finished products right from the comfort of your home. However, finding the right 3D printer for your needs ...

NARRATOR: It's crunch time for the 3D crew. And who's going to take home the coveted, and totally pointless, prize of, eh… most properties? Two cubes high-five as they prepare to compete.

Today's affordable 3D printers will likely surprise you: You can get a smooth-working machine with useful features once found only in high-end models. Starting at just $250, these are the top ...

Our team has tested over 50 of the best 3D printers and from prototyping to printing miniatures, business or beginner, these are the machines we recommend. We've assembled and hand-tested each of ...