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Why Did It Take So Long to 'Discover' Planet Nine?
science.howstuffworks.com/discover-planet-nine.htm
A massive planet seems to have been lurking on the edge of our solar system for some time now. Learn more about the Ninth Planet at HowStuffWorks Now.
What's Your Jewelry IQ?
play.howstuffworks.com/quiz/whats-your-jewelry-iq
Are you as smart about gems and jewelry metals as you think you are? From diamonds to moissanite, there's a lot to know. Show off your jewelry IQ in this quiz, and then you can consider yourself an expert!
How Junk Food Works
recipes.howstuffworks.com/junk-food.htm
Junk food is a miracle of edible engineering. Learn about the history and science behind junk food.
How Welding Works
science.howstuffworks.com/welding.htm
Welding is what makes bridges, skyscrapers and automobiles possible. Learn about the science behind welding.
Flower Trivia
play.howstuffworks.com/quiz/flower-trivia
Flowers have fascinated humankind since the dawn of time. Do you know which country came to value tulips over gold? Or which flower is a symbol of humility? Test what you know about blooms and blossoms now!
Which of These Animals Does Not Belong With the Others?
play.howstuffworks.com/quiz/which-of-these-animals-does-not-belong-with-the-others
Millions of animals exist in the world. Reptiles, mammals, fish and insects all coexist with us. How are they alike? How are they different? Take our quiz, and see if you know the answers!
Can You Identify These Flowers That Grow From Bulbs?
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Not all daffodils, tulips and lilies grow from bulbs, but there's a hefty bouquet of these and other flower species that do grow from the fleshy stems. Show off your flower power and separate the bulbous from the nonbulbous blooms!
Can You Name All of These American Wildflowers?
play.howstuffworks.com/quiz/can-you-name-all-of-these-american-wildflowers
Tom Petty said, "You belong among the wildflowers." But would you be able to name them if you saw them in an image? Check out the ones we've put together, and see how well you know the wildflowers of America!
Can You Pass This Moon Phases Quiz?
play.howstuffworks.com/quiz/can-you-pass-this-moon-phases-quiz
We humans have always had a profound connection to the moon, but do we really know it? Test your knowledge of the various phases our little neighbor goes through, how those phases may actually impact us, all while you enjoy other fun lunar facts along the way!
Can You Identify These Night-Blooming Flowers?
play.howstuffworks.com/quiz/can-you-identify-these-nightblooming-flowers
There are countless flowers that emerge in the morning to meet the sun, but you may be surprised to learn just how many species reach peak bloom long after the sun has set. Take our quiz to see how many of these night-bloomers you can name!