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HowStuffWorks Newsletter Quiz

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If you took one of our recent newsletter quizzes, you've come to the right place for the answers.

What is relativity?

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Relativity is the famous theory that was created by Albert Einstein. Learn about relativity in this article from HowStuffWorks.

Uncovering Lake Vostok, Hidden Under 2 Miles of Antarctic Ice

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Deep underneath Antarctica, there lies a hidden lake. Roughly the size of North America's Lake Ontario, the buried landmark has inspired curiosity and controversy for decades.

How does public transportation help the environment?

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In January 2004, the citizens of Milan, Italy, were preparing for a strike that would shut down all public transportation. Since an estimated 28 percent of greater Milan's 3 million populace relied heavily on public transit, the strike meant gridlock for most of the city.

Every Celtic Knot Holds Meaning Within Its Intricate Design

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Have you ever noticed the intricate, interlacing patterns adorning ancient manuscripts, stonework or modern jewelry and wondered about their origin? These are different versions of the Celtic knot, a quintessential element of artistic expression that traces back to the ancient Celts.

What are the pros and cons of hydrogen energy?

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What are the pros and cons of hydrogen energy? Learn about this innovative green technology and the pros and cons of hydrogen energy.

How Hot Is the Sun? Colder, the Closer You Get!

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How hot is the sun, and why does this star's atmosphere hit higher temperatures than its core? Read on to learn about the weird physics.

How Long Does the Once-dimming Star Betelgeuse Have Left?

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Star-gazers gasped when they saw how much Betelgeuse dimmed in 2019 and the reason wasn't clear. Even though it's back up to full strength, how long will it be before it explodes? We haven't seen a supernova in over 400 years.

'Avengers: Endgame' and the Science of the Marvel Universe

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HowStuffWorks talks to Sebastian Alvarado, scientist and author of a book on the science of the Marvel Cinematic Universe

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