Coin Batteries

Apple AirTags are super helpful for keeping track of your keys, backpack, and other frequently misplaced items, but there are some pretty clever things you can do with them beyond finding your stuff. Apple's $29 Bluetooth beacons definitely drew some inspiration from Tile's l ...more

Homopolar motors tend to be typecast as simplistic in nature, and that's true for the most part. The bare minimum requirements are a battery, conductor, and magnetic field, but when it comes to Valentine's Day, they're nothing short of complex. At least, when it comes to the ...more

Rockets are lots of fun when you are launching them. However, finding them can be an arduous if not maddening task. Fancy space rockets have lots of tracking equipment to make touchdowns as simple as pie. Today, we look at embedding LEDs into your hobby rocket for easy night f ...more

Valentine's Day is almost here, and if you're like me, you're scurrying to do something special for your mate. The standard chocolates and flowers just isn't cutting it anymore, and you can only make so many homemade cards before it becomes banal and meaningless. So, what can ...more

It turns out that the popularity of soft circuit electronics has leaked out of the interwebs and into the hands of the U.S. military. Soft circuit electronics allow you to literally sew electronics circuits into fabric using flexible conductive thread instead of wire. Soft cir ...more

Can you really make an explosive from salt, sugar and weed killer? Does glycerol and water actually recover text from burnt paper? Is it possible to develop film with a first aid kit and some orange juice? MacGyver says yes. Want to know more of MacGyver's ingenious household ...more

When I was attending college, my friends had a phantom thief in their dormitory. Almost every night, a different item of food would go missing, never to be seen again. There was constant speculation as to whom the thief was and how to catch them. Security cameras were deemed t ...more

Fans of Doctor Who know that the sonic screwdriver is the ultimate tool. It can unlock doors, turn on lights, detect life forms, solder wires, and sabotage weapons. Presumably, the sonic screwdriver creates sonic vibrations to achieve whatever the doctor wants by vibrating th ...more

Dreams are like an internal human holodeck. Inside your mind, anything is possible, from your grandest wishes to your worst nightmares. This is all well and good, but what if you could control your dreams and become the omniscient god of a handpicked reality whenever you go to ...more

Stuck behind bars? Held hostage by a guy with a flamethrower? Thanks to the wise and resourceful 80s secret agent MacGyver, these problems can be resolved by a car battery, two coins and some jumper cable. Sound absurd? Did you see this year's Superbowl MacGruber Pepsi ad? Ma ...more

Over the past two product cycles, Apple has been rumored to be preparing to reveal its Apple AirTags tracking devices that can help iPhone owners find their possessions with augmented reality. Now, it's 2021, and AppleTags are nowhere to be found. But Samsung has leapfrogged ...more

Obviously, millionaires like me don't really have to worry about an empty wallet, but for the rest of you out there, having no cash when it comes time to paying a bill can be excruciatingly embarrassing. There is nothing worse than going up to a register thinking you've got s ...more

The cell phone may have replaced the pocket watch, but thanks to some clever mods and hacks, "old-fashioned" time telling is making a comeback. Smart watches that connect to your mobile device cannot only tell you what time it is, but also change the song you're listening to a ...more

You've probably seen the classic fruit battery science experiment a thousand times, but I doubt you've ever seen it turned into an art project! Photographer Caleb Charland uses everyday objects like apples, coins and vinegar to create makeshift batteries, then takes these gorg ...more

Shooting a photo or video in a car can be rather difficult without a proper mount, and if you want to secure your camera outside the car, it can be just plain expensive. Luckily, there are tons of DIY camera mounts for both inside and outside your vehicle, and most of them are ...more

LIGHTFAKTOR is a Cologne artists collective experimenting with the "possibilities yielded by bulb (long-term) exposure and painting." The technique employed has been coined "light writing" - Wikipedia's definition: "Light writing is an emerging form of stop motion animation ...more

Super Mario Run has been one of the most insidiously addicting iOS games to come out in recent years for iPhone. And now, as of March 22, Android users can get in on the fun, too. You can install Super Mario Run from either the iOS App Store (requires iOS 8 or higher) or Goog ...more

What's a penny worth these days? Not much. But could there be some free energy hidden inside your spare pennies? You'd be surprised! See how I hack together stacks of pennies into makeshift batteries that can drive small-current devices like LEDs and calculators. Video: . You' ...more

On the list of problems with Android, manufacturer tinkering ranks near the top. Slow or nonexistent updates, poor performance, excessive bloatware apps—all of these things can be attributed to manufacturer skins like TouchWiz or Sense, and none of them are issues with unmodif ...more

"Ahoy-hoy." If telephone titan Alexander Graham Bell had his way, we'd all be answering phones like Mr. Burns. Thankfully, frienemy Thomas Edison had enough sense to realize we weren't always on the briny. He preferred "hello" as our standard telephone greeting, which he is c ...more

If you want to get started sniffing Wi-Fi networks, you usually need to start with a wireless network adapter. But thanks to a Wi-Fi sniffing library written in Arduino and the ultra-cheap ESP8266 chip, you might not need one. For less than $10 in electronics, you can build a ...more

In a way, Twitter is the town square of our era, where people can share and discuss ideas on a wide variety of topics. While the tech giant has its own app for Android, it's pretty bare-bones when it comes to features. This has paved the way for third-party clients that are ri ...more

You don't have to be a frequent flyer to know how indispensable navigation apps have become. Many of us rely on these apps for traveling from state to state and getting around in foreign cities, but even more of us count on these apps to beat rush hour traffic and find the qui ...more

Twitter's official iOS app is adequate if you're not much of a tweeter, but if you are, there's a lot of useful features that are missing. Luckily, there are plenty of free Twitter clients available that you can use on your iPhone. These third-party apps have features such as ...more

While our smartphones are many things, one of their primary functions is to make calls. Many of us try to avoid ever having to make calls, but there are situations when it's a must, such as wishing your grandma happy Birthday or calling 911 — and in those times you want stella ...more

You can feel it in your bones. You may die if you don't get this phone. There's just one problem — the price. Suddenly, you come across what seems like manna from heaven. That very device, at a deeply discounted rate, can be yours. The only thing that makes you pause is that ...more

Now that Google has announced its new Pixel smartphones, folks who rushed to buy an iPhone 7 might be experiencing a bit of buyer's remorse. The new Pixel and Pixel XL are packed to the brim with cutting-edge features and top-notch hardware, and Google seems to be taking direc ...more

Apple's latest update, iOS 14.2, is finally here. As the name implies, it's the second major update to hit iPhones since Apple released iOS 14 in the fall. The update brings at least 13 new features and changes to all compatible iPhones, including over 100 new emoji and eight ...more

Apple CEO Tim Cook has said that augmented reality (or, AR for short) will "change everything." But what, exactly, is augmented reality? Generally, augmented reality refers to the process of presenting virtual objects and imagery — usually through a wearable lens or external ...more

On this platform, we talk a lot about the future of augmented reality, and we pay attention to what is being said elsewhere as well. Sometimes the future chatter is about the hardware. Even more frequently, in recent months, the discussion is about the future of the AR cloud, ...more

The App Store has been around for almost 14 years now, and during that time, we must have seen over a million games come and go and stay and expand. But only a tiny fraction of those games have become blockbuster sensations because of the mighty App Store's reach on iPhone and ...more