Humans Take a Step Closer to ‘Flying Cars’
In the 1880s, the first automobile was developed and about two decades later, the Wright brothers in North Carolina invented the first successful airplane. Today, the world is closer to combining those two concepts as a Japanese tech company said it completed a manned test flight of a “flying car.” The company, SkyDrive, said in a news release on Friday that it had completed a flight test using “the world’s first manned testing machine,” its SD-03...read more
The Birth of the Renaissance: Understanding the Genesis of a New Era
By conservative estimates, the European Renaissance spans the historical period of the 15 th and the 16 th centuries, an era when artists produced many of greatest masterworks ever created. During this time Columbus landed in the New World, the Protestant Reformation was launched, and the Scientific Revolution...read more
Top 10 Free Sites for Creating Digital Art
These free digital art creation sites range from simple web apps for preschoolers to sophisticated software for advanced students, educators, and professionals. These free digital art creation sites range from simple web apps for preschoolers to sophisticated software for advanced students, educators, and professionals. While some can serve as essential digital tools for in-classroom or online art curricula, all are fun to explore and experiment with... read more
Did you solve it? The smallest biggest triangle in the world
Show that there is a triangle, the sum of whose three heights is less than 1mm, that has an area greater than the surface of the Earth (510m km2). I’ll take you through slowly how I got there. The area of a triangle is half the base times the height. Since there are three possible bases (and heights) there are thus three ways of describing the area of the same triangle. If triangle T has side lengths a, b, and c, and h...read more
935 Saint Wenceslas is murdered by his brother, Boleslaus I of Bohemia
1887 Yellow River or Huáng Hé floods in China, killing between 900,000 and 2 million people, one of the deadliest natural disasters in history
1939 German-Soviet Frontier Treaty is signed by Joachim von Ribbentrop and Vyacheslav Molotov; redraws German and Soviet spheres of influence in central Europe and transfers most of Lithuania to the USSR
Here's how to make this cool origami dragon
Jo Nakashima has made a few improvements on his origami dragon design for 2020. It's great because he now shows the illustrated diagram while doing the folding. In this tutorial you'll learn how to make an origami Dragon step by step. This new version of my origami dragon has not only a better shape, but also more improvements! It has a longer neck, tail and horns, better structure with less tension (so it holds better the shape) and a better folding sequence. I hope the video length does not discourage you to fold it, it's not that hard! (actually, maybe it's even easier than the first version because the folding sequence is better).
How to Save Our Plan
What is Our Planet? A Netflix original documentary series and groundbreaking collaboration between WWF, Netflix and Silverback Films, Our Planet showcases the world's natural wonders, iconic species and wildlife spectacles that still remain. We're all a part of this amazing planet, but we're changing it like never before. Discover the story of the one place we all call home.
This square shape can roll, but why?
The Action Lab looks deeper into why strange-shaped objects like this octohedron can roll. A lot of it is about friction, or lack of slipping. Part of the issue is probably materials as well, as an object has to be sufficiently dense for the rolling to continue. These heavier objects just need a shove of energy to get them going, then their linear and angular momentum do the rest.