Back in 1850, all chess games basically started the same way. In 1920, that changed. Then, in 1940, it changed again. What's going on here? After hundreds of years, shouldn't we know the perfect way to start a game of chess? It turns out that there is no mathematically "correct" way to start a game of chess. Give it a watch, and maybe your game will improve.

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If you've ever gathered around a campfire, you might have noticed the smoke seems to follow you no matter where you are. No, it's not your bad luck — there's actually a scientific reason behind it.

Optical illusions can be fun, but they also shed light on the complex ways our brain can convert a 2D image into a 3D space in our minds. So what can we learn from an excellent optical illusion, and what are we still looking to discover?

Modern aviation is one of the greatest engineering achievements, especially considering all it takes to develop safe air travel. But today's planes use an excessive amount of fuel, which is why engineers are working to make them more efficient. And for that, they're turning to nature.

From cringing at the pump to getting an eye-popping check at your favorite restaurant, inflation is hitting us all where it hurts. That’s why I started using Upside to get cash back on every purchase, whether it's gas, groceries or even dining out. Simply download the free Upside app and use promo code KIM for 25 cents or more back for every gallon on your first tank of gas. And, when you claim an offer for whatever you’re buying on Upside, "check in” at the business, pay as usual and get paid! When compared to credit card rewards or loyalty programs, you can earn 3x more cash back with Upside. Upside users are earning more than $1 million every week.