The Reason Why Your Car’s Turn Signal Makes a Clicking Sound

Zmaj88, iStock / Getty Images Plus
Zmaj88, iStock / Getty Images Plus

The clicking of a turn signal ranks among the least-annoying sounds a car can make. Along with the flashing bulb behind the arrow in your car's dashboard, the gentle, rhythmic tick tick tick-ing tones are a sign that your blinker is working properly when you switch it on. Even as technology has progressed, this feature has remained a constant throughout generations of vehicles—or at least that's how it appears to drivers. According to Jalopnik, there's one thing that has changed, though: the actual source of that familiar sound.

The flashing turn signals began appearing in automobiles in the late 1930s when Buick made them standard in some models. Traditionally, the clicking sound is made via heat. Drivers would switch on their blinker, and the electricity would heat up a bimetallic spring in the car, causing it to bend until it made contact with a small strip of metal. When these two components connected, a current would pass through them and power the electric turn signal lights. The bimetallic spring quickly cooled down and returned to its original form, turning off the light, before the whole process started again to create a new flash. As the spring bent back and forth, it created a clicking sound.

The next evolution of turn signals used a similar trick, but instead of moving a spring due to heat, it sent the electronic pulse to an electromagnet via a chip. When activated, the electromagnet pulled up a metal armature and disconnected the current powering the light (or the opposite, depending on the relay setup). Without the pulse from the chip, the electromagnet turned off and the armature returned to old position and bridged the circuit providing power to the bulbs. As was the case with the thermal spring, the relay clicked every time it moved.

Up until recently, this was how most car turn signals functioned, but things have changed as cars have become more computerized. Many car manufactured today rely on computer commands to activate their turn signals, skipping processes that once produced the distinctive clicks. But the clicking sounds are something people grew up with, and drivers might be unsettled if they heard nothing after activating their blinkers. That's why the mechanical sound still exists in the computer era—even though in many modern cars, it's actually just being broadcast through the vehicle's audio system.

For a visual of how electronic flasher signal systems work in cars, check out the video below.

[h/t Jalopnik]

The Reason Why Baking Makes You Feel Good, According to Psychologists

Liderina/iStock via Getty Images
Liderina/iStock via Getty Images

Whether you're nibbling a slice of zucchini bread or an extra-chewy chocolate chip cookie, it’s always fun to be the taste tester for a friend or relative who loves to bake. And, while eating products created with love (and sugar) probably makes you feel good, the baker is reaping some psychological benefits, too.

Studies have shown that creative activities like baking and knitting contribute to an overall sense of well-being. Boston University associate professor of psychological and brain sciences Donna Pincus told HuffPost that there’s “a stress relief that people get from having some kind of an outlet and a way to express themselves.”

Baking is also a great way to practice mindfulness, because it requires you to focus on following very straightforward directions in a specific order. In other words, most of the decisions have already been made for you, allowing you to concentrate on the details while nudging your mind away from the stressors and anxieties of your life outside the kitchen. Julie Ohana, a licensed clinical social worker and culinary art therapist, explained to HuffPost that baking is therapeutic because it helps you practice the “balance of the moment and the bigger picture.” While you’re measuring and mixing ingredients, you’re probably visualizing how they’ll all come together to create a fulfilling final product, and deciding how and when you’ll share it with others.

Sharing your desserts—altruistically rather than for attention or competition—is another mood-booster, making you “feel like you’ve done something good for the world, which perhaps increases your meaning in life and connection with other people,” Pincus said. It can also function as a mode of communication. Susan Whitbourne, professor of psychological and brain sciences at the University of Massachusetts, told HuffPost that “it can be helpful for people who have difficulty expressing their feelings in words to show thanks, appreciation, or sympathy with baked goods.”

If baking just isn’t for you, that’s OK, too—try one of these other stress-reducing tactics instead.

[h/t HuffPost]

The Reason Why Objects in a Car’s Side-View Mirror Are Closer Than They Appear

aydinozcanbaz/iStock via Getty Images
aydinozcanbaz/iStock via Getty Images

“Objects in mirror are closer than they appear.” It's a warning you see in basically every car, but why can't passenger-side mirrors display objects accurately? Well, it's actually a careful design choice made with safety in mind.

The way we see things is dependent on how light reflects off objects around us. An object's color, texture, shape, and other characteristics influence the direction and intensity of light that bounces off them. If the objects are reflected off an intermediate object, like a mirror, our perception of the original object may be distorted.

The shape of the mirror also makes a difference in our perception. In the U.S., passenger-side mirrors are convex (curved slightly outward), whereas driver-side mirrors are flat. A convex mirror placed on the passenger side reduces the driver's blind spots on that side of the vehicle by presenting a wider field of view, but it also makes other cars appear farther away due to a slight distortion caused by the shape. The flatter mirror on the driver’s side produces a more accurate depiction of what’s behind the car with a more narrow field of view, since light bounces off in the same direction that it hits the mirror and doesn't distort the reflection of the object.

When the two mirrors' reflections are combined in the driver's point of view, drivers have the ability to both see wider areas on the passenger side while keeping their eyes (mainly) on the road. The flat-convex combo has been the U.S. standard for years, though the U.S. Department of Transportation is looking into the safety benefits of two convex mirrors, which European cars usually sport.

For now, always remember to check your mirrors frequently, and look over your shoulder before you change lanes. (Don't forget your turn signal!)

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