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Tennis star Billie Jean King has had a lasting influence on sports and beyond.

Billie Jean King is one of tennis’ most celebrated athletes. But she also championed gender equality efforts and fought for equal pay in sports.

Whether it's the proximity to the sea or a slice of history that pulls you in, these lighthouses offer something for everyone.

Man reading from a microfilm machine, which uses a similar technology to Brown's "Readies."

Machines called “Readies” were writer Bob Brown’s answer to “talkies” in the 1930s.

Before you head to the beach, don't forget to apply sunscreen to these key spots.

Even if sunscreen is part of your daily routine, there might be some major areas—like your eyelids—where you’ve been forgetting to apply it.

The red velvet origin story is a widespread urban legend.

From what makes red velvet cake red (and velvet, for that matter) to its highly dubious origin story, here’s what you need to know about this delicious dessert.

Leonardo da Vinci’s ‘The Last Supper’ (black border added).

Leonardo da Vinci's "The Last Supper" is one of the most admired, most studied, and most reproduced paintings the world has ever known—and it has inspired some wild theories.

Enlist the help of a robot vacuum to make cleaning a snap.

Mental Floss and Roborock have teamed up to share six simple tips for keeping your house clean without compromising cleanliness.

Presented by: Roborock

AnnaPustynnikova/iStock via Getty Images

Ignacio "Nacho" Anaya García invented his namesake bar snack while working in a restaurant near the Texas-Mexico border.

Unpacking the reason hyperlinks are blue requires dipping into early internet history.

Before venturing outdoors, read up on the most common myths about ticks.

Charred gunk on your grill can inhibit performance and lead to a bummer of a burger. Here’s how to fix it.

Ever wonder what your dog finds so tasty about grass?

A dog that eats grass frantically may be trying to vomit—but the behavior doesn't automatically warrant a trip to the vet.

A grocery store’s layout strategy is very calculated—and rearranging inventory is meant to confuse you.

CNN's graphics team took this map and made it interactive.

This color-coded earthquake risk map can help you determine your chances of feeling seismic activity in your area.

It does for pools what robot vacuums do for your house—and now you can save big.

This robotic pool cleaner takes the hassle out of cleaning, and now you can get this Amazon bestseller on sale for a great discount.

Learning how to pronounce ‘biopic’ is one thing. Understanding why it’s such a commonly mispronounced word is another.

Have a dad who is hard to shop for? Here are the best Father’s Day gifts for all kinds of father figures, including everything from multitools to beard-trimming kits and more.

If you lived through the 1990s, the retro commercials in this video may look familiar.

A mural showing Harvey Milk inside the San Francisco politician's former camera shop.

Stonewall is the most famous, but it’s just one of many American sites that hold significance for LGBTQ history.

And how does a range fit into all this?

From a record-breaking mountain climber to a British adventurer who may have died searching for a city that doesn’t exist and beyond, these explorers have fates that are shrouded in mystery.