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How to Make a Galton Board

The bean machine, also known as the Galton Board or quincunx, is a device invented by Sir Francis Galton to demonstrate the central limit theorem, in particular, that with sufficient sample size the binomial distribution approximates a normal distribution. [Wikipedia]…
PaperSizes | International Paper Sizes & Dimensions | Abakcus

PaperSizes

PaperSizes is the best resource with a clean and minimal interface for International paper sizes, dimensions, and formats.

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24 Science Fiction Books That Forecast the Future

24 Science Fiction Books That Forecast the Future

Many past writers have predicted our present society’s facts with a level of detail that seems impossibly accurate. In reality, their imaginations were painting portraits that would eventually be mirrored…

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How to Make Wave Machine

We’re surrounded by waves! Sound and light travel as waves to our ears and eyes. Ocean waves crash onto the beach. Radio waves broadcast music to our cars. We even…

Folding Letters

These DIY folding letters are great as decoration in kids’ rooms. You can create names or other fun words. And by using colored paper you can brighten up any room!…