This may sound strange, but there’s something profoundly poignant about pen refills. A brand new pen is a magical thing—filled with boundless promise and potential. And yet, as you use the pen to make that potential a reality, you also hasten the day when it has nothing left to give. In other words, writing makes pens run out of ink.

Luckily, refills offer a cheap and easy way to restore your pen to its original glory. The only question is: Which refill do you need? There are so many to choose from, and there are few things more frustrating than finally getting a refill you’ve been waiting for, tearing it open in anticipation, and finding that it doesn’t fit.

Fear not—in this guide, we will arm you with the knowledge you need to find the right refills for your pens and avoid wasting time and money on ones that won’t work.

This easy Lavash Bread recipe will teach you how to make Armenian flatbread using only 3 ingredients: flour, salt, and warm water. This bread can be used to wrap around falafel, eaten with cheese and herbs, or as an amazing thin crispy pizza crust!

Qodem is a public domain re-implementation of the DOS-era Qmodem serial communications package.

It is often necessary to reverse engineer images of data visualizations to extract the underlying numerical data. WebPlotDigitizer is a semi-automated tool that makes this process extremely easy: