The Reason Why Your Car Window Is Edged With Tiny Black Dots

iStock.com/Kameleon007
iStock.com/Kameleon007

If you spend a lot of time staring straight ahead while stuck in traffic, you may have wondered what those tiny black dots circling the edges of your car’s windshield are. Or maybe you've never even noticed them. They’re easy to miss, but according to Jalopnik, they serve a few important functions.

That black strip that wraps around the window is called a frit or a frit band, and it’s essentially ceramic paint that has been baked into the glass in a way that makes it impossible to scrape off. It’s there to protect the urethane sealant holding your windshield in place from ultraviolet rays, which, under less secure circumstances, could cause the glass to pop out.

“The frit band also acts to provide a rougher surface for that adhesive to stick to, and it’s a visual barrier, preventing people from seeing that nasty glue from outside,” David Tracy wrote for Jalopnik. The frit has been commonplace since the 1950s and ‘60s, when car manufacturers started swapping out metal trim for adhesives.

Ok, so that explains the solid black strip, but what about those dots?

The reason the dots get smaller as they move inwards is because it creates a gradient pattern that’s more aesthetically pleasing and less obvious—and distracting—to both drivers and passengers.

The dots aren’t there just to look pretty, though. Much of the design has to do with the way windshields are made: When the glass is bent in an oven, the frit heats up faster than the rest of the windshield because it’s black. To reduce optical distortion as a result of this thermal disparity, a dot gradient is used to even out the temperature.

You can also thank a second set of dots on your windshield—right behind the rearview mirror—for helping to keep the sun out of your eyes as you drive.

Now that you're an expert on frit bands, check out our guide to the meanings behind 15 different symbols on your car's dashboard. Never again will you miss another tire pressure warning.

[h/t Jalopnik]

10 of the Most Popular Portable Bluetooth Speakers on Amazon

Altech/Bose/JBL/Amazon
Altech/Bose/JBL/Amazon

As convenient as smartphones and tablets are, they don’t necessarily offer the best sound quality. But a well-built portable speaker can fill that need. And whether you’re looking for a speaker to use in the shower or a device to take on a long camping trip, these bestselling models from Amazon have you covered.

1. OontZ Angle 3 Bluetooth Portable Speaker; $26-$30 (4.4 stars)

Oontz portable bluetooth speaker
Cambridge Soundworks/Amazon

Of the 57,000-plus reviews that users have left for this speaker on Amazon, 72 percent of them are five stars. So it should come as no surprise that this is currently the best-selling portable Bluetooth speaker on the site. It comes in eight different colors and can play for up to 14 hours straight after a full charge. Plus, it’s splash proof, making it a perfect speaker for the shower, beach, or pool.

Buy it: Amazon

2. JBL Charge 3 Waterproof Portable Bluetooth Speaker; $110 (4.6 stars)

JBL portable bluetooth speaker
JBL/Amazon

This nifty speaker can connect with up to three devices at one time, so you and your friends can take turns sharing your favorite music. Its built-in battery can play music for up to 20 hours, and it can even charge smartphones and tablets via USB.

Buy it: Amazon

3. Anker Soundcore Bluetooth Speaker; $25-$28 (4.6 stars)

Anker portable bluetooth speaker
Anker/Amazon

This speaker boasts 24-hour battery life and a strong Bluetooth connection within a 66-foot radius. It also comes with a built-in microphone so you can easily take calls over speakerphone.

Buy it: Amazon

4. Bose SoundLink Color Bluetooth Speaker; $129 (4.4 stars)

Bose portable bluetooth speaker
Bose/Amazon

Bose is well-known for building user-friendly products that offer excellent sound quality. This portable speaker lets you connect to the Bose app, which makes it easier to switch between devices and personalize your settings. It’s also water-resistant, making it durable enough to handle a day at the pool or beach.

Buy it: Amazon

5. DOSS Soundbox Touch Portable Wireless Bluetooth Speaker; $28-$33 (4.4 stars)

DOSS portable bluetooth speaker
DOSS/Amazon

This portable speaker features an elegant system of touch controls that lets you easily switch between three methods of playing audio—Bluetooth, Micro SD, or auxiliary input. It can play for up to 20 hours after a full charge.

Buy it: Amazon

6. Altec Lansing Mini Wireless Bluetooth Speaker; $15-$20 (4.3 stars)

Altec Lansing portable bluetooth speaker
Altec Lansing/Amazon

This lightweight speaker is built for the outdoors. With its certified IP67 rating—meaning that it’s fully waterproof, shockproof, and dust proof—it’s durable enough to withstand harsh environments. Plus, it comes with a carabiner that can attach to a backpack or belt loop.

Buy it: Amazon

7. Tribit XSound Go Bluetooth Speaker; $33-$38 (4.6 stars)

Tribit portable bluetooth speaker
Tribit/Amazon

Tribit’s portable Bluetooth speaker weighs less than a pound and is fully waterproof and resistant to scratches and drops. It also comes with a tear-resistant strap for easy transportation, and the rechargeable battery can handle up to 24 hours of continuous use after a full charge. In 2020, it was Wirecutter's pick as the best budget portable Bluetooth speaker on the market.

Buy it: Amazon

8. VicTsing SoundHot C6 Portable Bluetooth Speaker; $18 (4.3 stars)

VicTsing portable bluetooth speaker
VicTsing/Amazon

The SoundHot portable Bluetooth speaker is designed for convenience wherever you go. It comes with a detachable suction cup and a carabiner so you can keep it secure while you’re showering, kayaking, or hiking, to name just a few.

Buy it: Amazon

9. AOMAIS Sport II Portable Wireless Bluetooth Speaker; $30 (4.4 stars)

AOMAIS portable bluetooth speaker
AOMAIS/Amazon

This portable speaker is certified to handle deep waters and harsh weather, making it perfect for your next big adventure. It can play for up to 15 hours on a full charge and offers a stable Bluetooth connection within a 100-foot radius.

Buy it: Amazon

10. XLEADER SoundAngel Touch Bluetooth Speaker; $19-$23 (4.4 stars)

XLeader portable bluetooth speaker
XLEADER/Amazon

This stylish device is available in black, silver, gold, and rose gold. Plus, it’s equipped with Bluetooth 5.0, a more powerful technology that can pair with devices up to 800 feet away. The SoundAngel speaker itself isn’t water-resistant, but it comes with a waterproof case for protection in less-than-ideal conditions.

Buy it: Amazon

This article contains affiliate links to products selected by our editors. Mental Floss may receive a commission for purchases made through these links.

Key West Has Installed Permanent Rainbow Crosswalks

In Key West, rainbow crosswalks aren't just for Pride Month.
In Key West, rainbow crosswalks aren't just for Pride Month.
Maxvis/iStock via Getty Images

In 2015, Key West became the first place in Florida to install permanent rainbow crosswalks—a celebration of LGBTQ+ pride that reflected the city’s “One Human Family” motto. But a few years later, the city decided to repave its historic Duval Street, which required tearing up the four colorful paths at the intersection of Petronia Street.

The rainbow crosswalks finally returned this week—just in time for Pride Month—and they’re even more vibrant than before. The old ones were essentially regular white crosswalks with each empty space filled in with a different color, whereas the new paths feature long, colored stripes with a white stripe along the top and bottom edges.

According to NBC 6 South Florida, workers positioned the thermoplastic stripes on the street and attached them to the pavement below with heat from propane torches. Key West mayor Teri Johnson and other officials then commemorated the new landmarks, located in the heart of the city's entertainment district, with a ribbon-cutting ceremony. (The ribbon was also rainbow colored, and all participants wore masks to prevent the spread of coronavirus.)

“The rainbow crosswalks mean that everybody is welcome, everybody is equal, everybody is recognized, and that we do really abide by the ‘One Human Family’ spirit,” Johnson said.

Key West isn’t the only place with permanent rainbow paths; as LGBTQ Nation reports, you can find them in San Francisco, West Hollywood, Seattle, Philadelphia, Toronto, and other cities, too. And while the small island city has postponed its Pride events until November due to the pandemic, some of the world's biggest Pride parades and festivals are simply moving the party online: Here are 10 events to check out this month.

[h/t NBC 6 South Florida]