Allen Cadwallader

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The Battle of Philippi 42 BCE

The Battle of Philippi in 42 BCE was an all-Roman affair fought between the young Octavian, chosen heir of Julius Caesar, and the mercurial Mark …

Ancient History

Learn all the new gestures for iPhone X

The iPhone X has no home button. We already know that, but what does it mean when you’re actually using the phone? The home button is the most important button on the iPhone. It wakes it up, gets you to the home screen, activates Apple Pay, invokes Siri, takes a screenshot, and helps you force the …

A NASA video shows what a total lunar eclipse looks like from the moon, and it's mind-blowing

There is only one cosmic phenomenon that could generate this seemingly red ring of fire around Earth:<p>Thanks to this incredible animation by NASA's Scientific Visualization Studio, you can see what this month's total lunar eclipse will look like from a vantage point unlike any other: the moon.<p>If …

The 11 Most Beautiful Mathematical Equations

Photo Credit: Shutterstock/R.T. Wohlstadter<p>Slide 1 of 23<p>Introduction<p>Mathematical equations aren't just useful — many are quite beautiful. And many …

General Theory of Relativity explained: The beautiful simplicity (and weird time sags) of Einstein's 100-year-old masterpiece

In his youth, Albert Einstein spent a year loafing aimlessly. You don't get anywhere by not "wasting" time – something, unfortunately, which the …

Physics

Rare 'Supermoon' Total Lunar Eclipse Coming This Month

<b>Editor's note:</b> To find out more about the rare supermoon lunar eclipse of Sept. 27-28 and how to see it, visit: Supermoon Lunar Eclipse 2015: Full …