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This First-Grade Math Problem Is Stumping the Internet

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If you’ve ever fantasized about how much easier life would be if you could go back to elementary school, this math problem may give you second thoughts. The question first appeared on a web forum, Mashable reports, and after recently resurfacing, it’s been perplexing adults across social media.

According to the original poster AlmondShell, the bonus question was given to primary one, or first grade students, in Singapore. It instructs readers to “study the number pattern” and “fill in the missing numbers.” The puzzle, which comprises five numbers and four empty circles waiting to be filled in, comes with no further explanation.

Some forum members commented with their best guesses, while others expressed disbelief that this was a question on a kid’s exam. Commenter karrotguy illustrates one possible answer: Instead of looking for complex math equations, they saw that the figure in the middle circle (three) equals the amount of double-digit numbers in the surrounding quadrants (18, 10, 12). They filled out the puzzle accordingly.

A similar problem can be found on the blog of math enthusiast G.R. Burgin. His solution, which uses simple algebra, gets a little more complicated.

The math tests given to 6- and 7-year-olds in other parts of the world aren’t much easier. If your brain isn’t too worn out after the last one, check out this maddening problem involving trains assigned to students in the UK.

[h/t Mashable]

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Brush Up on Your Film Trivia With This Website Dedicated to First and Last Lines From Popular Movies
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Few elements of a film are more important than its opening and closing lines. In some cases, they divulge pivotal truths or serve as bookends to establish the movie’s overall tone. In others, they provide important context or reveal key information about the lead characters.

No matter which purpose these snippets of dialogue serve, the most iconic establishing or concluding film lines are perhaps the most quotable ones. (After all, how many Citizen Kane fans can hear the phrase “Rosebud” without being reminded of Kane’s favorite childhood sleigh?) But if you can’t remember the openers and closers from your own favorite flicks, a new website is here to help you brush up on your pop culture knowledge.

Made by the team over at AT&T Internet, the fun reference site takes iconic blockbusters and presents their first and last lines of dialogue using typography and the occasional illustration. The site “is a way to recap the last 50 years of movies into a slideshow,” communications manager Alex Thomas tells Mental Floss.

You can check out AT&T Internet’s online slideshow of first and last lines—featuring bits from 1972’s The Godfather, 1999’s The Sixth Sense, 1994's The Shawshank Redemption, and more—here.

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Watch Craftsmen Shape Gobs of Molten Glass into Colorful Marbles
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Marbles aren't just for schoolchildren. Humans have likely been playing with the tiny toys for thousands of years, as indicated by ancient Egyptian artifacts and other objects studied by archaeologists. These trinkets have been crafted from materials including clay, stone, wood, glass, and metal. But in the early 1900s, Akron, Ohio–based Martin F. Christensen changed the way the playthings are made when he invented an automated machine that produced glass marbles.

Christensen's machine ultimately paved the way for the mass production of marbles. But in the video below, you can see how they're made the old-fashioned way. Produced by The Magic of Making—a series of short educational films created along with BBC—and spotted by The Kid Should See This, the clip shows glass makers in action as they use large ovens to melt granules of sand into liquid, and as they stretch, twist, and shape the molten goo into fragile (yet still playable) creations.

[h/t The Kid Should See This]

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