How Do Night Vision Cameras Work?

Did You Know? Rats, mice, and other rodents communicate not just in the range of sound frequencies humans can hear (approximately 20-23,000 Hz), but in ultrasonic frequencies as high as 91,000 Hz. There is even evidence that some species, such as the brown rat, use ultrasound for echolocation. Geek Trivia Mickey Mouse’s First Spoken Words Were? Hot dogs! → Gosh! → Oh boy! → Pluto, no! → Advertisement Download Free Guide: 12 Tricks to Appear Smart in Email Your email writing, sending and ignoring skills are just as important as your nodding skills, and even more important than your copying and pasting skills. Here are 12 email tricks that will make you appear smart, passionate, dedicated and most of all, smart.Click here to download Want to Change Your Email Preferences? At some point in the past you subscribed to the How-To Geek newsletter, but if you'd like to change the frequency or unsubscribe, you can do so by clicking the button. Change my Subscription (or unsubscribe) Today's How-To Geek Articles By popular request, we're including a quick list of the daily articles at the top of the daily email as well as the regular format near the bottom. How to Monitor (and Reduce) Your Data Usage on Android How to Open Multiple Images in One Document in Photoshop How Do Night Vision Cameras Work? How to Block Someone on Facebook What Is Nest Aware, and Should You Pay for a Subscription? How to Remove the Fandango Movie and TV Stores From the Roku Home Screen How to Get Rid of McAfee’s Notifications and Bundled Software How to Get Detailed Measurements When Setting Indents and Tabs on the Ruler in Word How to Dim the Lights on the PlayStation DualShock 4 Controller What Is “Differential Privacy,” and How Does It Keep My Data Anonymous? How to Replace Your Mechanical Keyboard’s Keycaps (So It Can Live Forever) Geek Comic Today's Tech Term Impact Printer An Impact Printer is a printer that functions by banging a head/needle against a ribbon, thus transferring the appropriate characters onto the paper. What We're Reading This section contains what we're reading from around the web, along with commentary from our editors. Think of it like your daily digest of the most interesting things online. Video Games Do Guilt Better Than Any Other Art A movie might scare you or tug at your heart strings, but the amount of control you have over the course of a video game has the potential to wrack you with guilt in a way a movie or book never could. [Nautilus] We finally have a computer that can survive the surface of Venus Sulphuric rain is easy; not being cremated by 500°C or crushed by 90 atmospheres is hard. [Ars Technica] Meet the Warm Tone, the Software-Controlled Record Press Fueling Vinyl's Comeback The first new record presses built in over 30 years just came online. [Wired] How to become a best-selling author on Amazon in five minutes with three dollars A curious look at how to game the Amazon ranking system. [Quartz] How to Monitor (and Reduce) Your Data Usage on Android Increasingly sophisticated phones and data-hungry applications make it easier than ever to blow through your cellphone plan’s data cap…and incur nasty overage charges. Read on as we show you how to manage your data use. Read This Article → How to Open Multiple Images in One Document in Photoshop Photoshop isn't just a photography app; it's a powerful design tool. Opening a single image is easy, but what happens if you want to put together a poster with multiple different images? Read This Article → How Do Night Vision Cameras Work? Most security cameras come with night vision, which allow them to still see things even if it’s pitch black outside. But how does it work? Read This Article → How to Block Someone on Facebook Facebook is the world's most popular social network, and with that comes a load of problems. Not only do you have to deal with all the regular trolls you find online, but crazy exes, stalkers, and fake profiles looking to con you are all permanent fixtures. Read This Article → What Is Nest Aware, and Should You Pay for a Subscription? If you want your Nest Cam to store video recordings in the cloud so that you can retrieve them later on, you have to sign up for the company’s Nest Aware subscription service. But is it worth buying in the long run? Read This Article → How to Remove the Fandango Movie and TV Stores From the Roku Home Screen You probably bought a Roku to watch services like Netflix, Hulu, or Amazon. Maybe you’ll even check out some free video channels. But you probably don’t have any interest renting or buying movies from Fandango. Read This Article → How to Get Rid of McAfee’s Notifications and Bundled Software McAfee, like most other modern antivirus programs, doesn’t stay out of your way. It installs browser extensions and shows various alert messages you might not want to see. If McAfee came with your PC, you may regularly see messages that your subscription is expired. Here’s how to get rid of that noise. Read This Article → How to Get Detailed Measurements When Setting Indents and Tabs on the Ruler in Word When setting indents or tabs on the ruler in Microsoft Word, you can see approximate measurements using the markings on the ruler. However, if you need more detailed measurements, there is an easy way to get this information. Read This Article → How to Dim the Lights on the PlayStation DualShock 4 Controller The DualShock 4’s light bar is a neat thing. It works with many games to mimic what’s happening on the screen—in The Last of Us, for example, it will change colors as your health degrades, and turn red as you die. It’s a little thing, but it’s cool. The downside is that it’s also a battery hog, causing the controller to die much quicker than most of us would like. Thankfully, you can dim it. Read This Article → What Is “Differential Privacy,” and How Does It Keep My Data Anonymous? Apple is staking their reputation on ensuring the data it collects from you remains private. How? By using something called “Differential Privacy.” Read This Article → How to Replace Your Mechanical Keyboard’s Keycaps (So It Can Live Forever) Mechanical keyboards have legendary longevity, but like any long-lived tool, that doesn’t mean they don’t require occasional replacement parts. Let’s take a well-loved mechanical keyboard and give it a brand new set of keys. Read This Article → Advertisement Download Free Guide: 12 Tricks to Appear Smart in Email Your email writing, sending and ignoring skills are just as important as your nodding skills, and even more important than your copying and pasting skills. Here are 12 email tricks that will make you appear smart, passionate, dedicated and most of all, smart.Click here to download