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How to Be Your Own SpaceX: Design, Build & Test Liquid-Fueled Rocket Engines

Move over NASA— SpaceX is taking over. Well, not really. But today, the privately funded spacecraft company broke all expectations when their Dragon capsule fell to a soft landing in the Pacific Ocean, completing an undoubtedly successful demo flight of nearly two full trips around Earth. It was the first re-entry of a commercial spacecraft ever, bringing commercial space transportation closer to reality.

Solidoodle: Cheap 3D Printing at Home for Under $500!

The possibilities are endless for 3D printing. With your very own 3D printer, you can make spare parts, circuit boards, inflatable balloons, duplicate keys, Minecraft cities, and even tiny replicas of your face. From a more artsy standpoint, you can make complex sculptures, like this cool mathematical sculpture of thirty interwoven hexagons by Francesco De Comite:

News: Make Insulating Glass Conductive with a Blowtorch!

Have a few light bulbs and a blowtorch? Then join the folks over at Harvard in a cool science experiment on the conductivity of glass. As you well know, glass is an insulator with low conductivity and high resistivity. In the video below, they flip the switch, demonstrating how heating the glass fuse enclosure from an incandescent light bulb can create a conductive material that completes the series circuit and lights the second light bulb. In the video, the two light sockets are wired in ser...

How To: Make an Arched Roof in Minecraft

This week, I will be covering one of my favorite styles of roofing in Minecraft—the arched roof. This is basically just a roof that starts out steep and slowly slopes down until it meets in the center. I think this type of roof looks great in Elvish-styled buildings and can make any build look very elegant and tall.

News: First Things First

Welcome to Compute & Conquer! This article may seem a little basic. We all have an idea of what a computer is but the fundamentals are necessary. Without knowing how something works, how can we determine a problem and find a solution when something goes awry? Way too often, I find myself helping someone with a very "easy to fix" problem on their computer. A problem which could have either been avoided or fixed had they had the basic knowledge of how to use a computer. Even worse, I've seen to...

News: Hector Martin's Alternate DCPU-16 Proposal Would Allow for a Better C Compiler

The developer community has already made some incredibly quick progress on implementing assemblers, interpreters, and emulators for the proposed virtual computer in 0x10c, Notch's latest game. But the truth is that the majority of programmers out there couldn't be bothered with spending enormous amounts of time writing anything much more complicated than a "hello world" application in assembly. What's on the top of everybody's mind is creating a compiler for a more widely used language.

News: Tactics for Using Stairs in Minecraft

The stair is considered by many people to be one of the, if not the most, versatile blocks in Minecraft. They can completely change the look and feel of a build and increase its quality. In this post, I will highlight just a few of the options you have for using them.

How To: Make a BB Machine Gun from a Soda Bottle

In a previous article, I showed how to make a powerful airsoft BB machine gun with a portable air supply using about $50 worth of PVC and air fittings. For this project, I have simplified the design to make a machine gun out of only 4 parts totaling about $15 that runs directly off of an air compressor.

How To: Electron Spirographs with a Cathode Ray Tube

In this article, I'll be showing you how to make a cool visual representation of sound using an old cathode ray tube (CRT) television, a stereo, and a sound source. You'll also need a pair of wire cutters, and a few screwdrivers. To properly understand this project, it's a good idea to learn a little bit about how CRT TVs work. Check out this article on how they work.

News: Space Painting with a Tesla Coil and One Million Volts of Electricity

Nikola Tesla. He was the man behind some of the greatest inventions of all time, including radio and alternating current. But perhaps his most visually fascinating invention is the Tesla coil. While maintaining a low current, it can produce dangerous high frequencies and voltages that can well exceed 1,000,000 volts, discharging it in the form of electrical arcs very similar to lightning.

SUBMIT: Your Craziest Funny Face Photo by January 30th. WIN: Massive Gummy Bear

This week's challenge will be the final Phone Snap Challenge, so let's make this count, everyone! To close off Phone Snap, we'd like to get a little silly. So start practicing all of your funny faces in the mirror and get those photo editing apps ready! Photograph somebody's funny face with your cell phone—whether it be your own, a family member's, a friend's, or your pet's, and post your very best shot to the Phone Snap community corkboard.

Edit on a Dime: The Week Ahead

Happy Monday to all of you out there, thankfully the Consumer Electronics Show is now behind us. It feels quite possible that a cold was caught by yours truly simply by reading the numerous reports of germs being spread from booth to booth on the show floor. I'll do my best to soldier on, in the meantime if you haven't already, you can experience the convention vicariously by reading my 'Best of CES' post here.

How To: Create an Automatic Animal Harvester in Minecraft

Welcome to Minecraft World! Check out our advanced tutorials and come play on our free server. Harvesting items from animals no longer requires wasting precious time chasing after them. During last Saturday's Weekly Workshop, we built a few different kinds of animal harvesters that worked in different ways, but for this guide we will be building the most compact and easy to use harvesters we made over the weekend.

News: The Top 10 Must-Have Skyrim Mods

Skyrim really took the cake this year. With its awe-inspiring gameplay, much improved combat and leveling system, and a fresh new look, it's no wonder the game has already received a Game of the Year award. But for hardcore gamers, the fun may be over. You've played the game for thousands of hours, and have exhausted the entire game's main and auxiliary quests. You need more.

How To: Convert Protected M4P Files to MP3 Songs with iMovie and iTunes

I'm not sure exactly when it happened, but it's awesome that you can now download music from the iTunes Store that's free of DRM (digital rights management) limitations. That was always my biggest problem with buying music from iTunes. Paying a buck for a song that I can only play on Apple devices? Really? That's what finally led me away to other legal music downloading services like eMusic and Amazon.

How To: Make Hanging Dried Persimmons (Hoshigaki)

A seasonal tradition brought over from Japan to America by Japanese-American farmers, making hoshigaki (as they're called in Japanese) is a fun outdoor autumn project you can do before the winter season really kicks in. Hang a bunch of peeled persimmons on a string outside, wait for three to five weeks, and harvest yourself some naturally dried persimmons during the winter months. Though peeling the fruit and then regularly massaging the fruit every few days after hanging may be more labor in...