Slime is a popular stress-relieving substance for hands that provides a calming effect and positively impacts hand motor skills. MyAppBook has released a free instructional book for Android users named "Как сделать слайм. Инструкция" that offers step-by-step guidance on making different types of slime. The book covers a wide range of slime-making methods, from magnetic slime to slime made from starch, baking soda, and even laundry detergent. It also includes safety instructions and tips for troubleshooting if the slime doesn't turn out as expected.

The instructional book is well-written, easy to follow, and includes clear instructions with pictures for each method. It is a great resource for anyone interested in making slime, particularly for children. The only downside is that the book is only available in Russian, which may limit its audience. Overall, "Как сделать слайм. Инструкция" is a useful guide for anyone interested in making different types of slime safely and easily.