If you are a chemical engineering student (or even in Mechanical, Civil, or Materials Science), you have heard the name whispered in hallways: Bird .

(Don't post illegal links in the comments, but feel free to DM your fellow engineers with library tips!) Struggling with the homework? Check out our next post: "How to solve Bird 2.10 (The cone-and-plate viscometer) without crying."

And remember: Bird isn't just a book. It's a religion. If you find the PDF, use it to learn the shell balance. Then, when you get your first job, buy the hardcover to put on your desk. You'll have earned it.