Where the written text or images are not enough and the video is too long, I recommend to insert only audio. I can handle .mp3 or .ogg. formats. I can offer readers a recording of a lecture or training, exercises using audio recording, pronunciation of foreign words, or a demonstration of animal sounds.

I can also explain things that can't be expressed in words. Enrich me with .mp4 (H.264 codec) and .webm video in the recommended resolution 720p HD, whether it's an aerial shot, a science experiment, or an interesting event. You can insert a YouTube link (works only online) or a preview in a small window that enlarges to full screen during playback. I will play the video directly in the mBook, so the reader does not have to switch to the browser and lose focus. In addition, I can group various videos into a gallery just like images.

Are you a fan of animations? I like to provide the readers with such unconventional content, just insert it using .gif or animated .svg format. If you are a more demanding user, I can also offer animations in JavaScript.

If you don't have a picture, just a poor quality scan, a piece of drawing or a diagram, I can deal with it as well. I will ask my graphic designer to redraw the poor quality source into the high-quality raster format .jpg or .png or vectors .svg or .pdf.

Sometimes, one image is not enough. Some topics are better explained using image layers. As you click on the captions, individual coloured layers will display one by one.

There are two sides to every story, just as there are two sides to every flip box suitable for learning foreign languages, for instance. You can put a picture on the front side and a word on the back. Learning in a fun way goes a long way, I'm sure we can agree on that.

Have you already written something in your mBook and you don't want to repeat yourself? Forget the frantic search and just put a link to an existing chapter or section. This will allow the reader to move quickly through the book by one click.

Why use a textbook and a workbook separately, when you can have them both in the same place? My favorite content is interactive exercises that allow students to test their knowledge and check their answers. The possibilities are endless, I can make any other variation at the author's request.

• insert an answer into a blank space
• drag and drop a word into a correct position
• drag and drop a word into a correct group
• select a correct solution from the menu
• use interactive elements which, for example, show hidden text and play sound when clicked
• drag and drop elements to create the right answer
• highlight correct and incorrect answers after check
• make automatic calculations based on assignment
• make exercises to check and calculate codes
• add up and subtract
• convert units

Even mathematicians, who swim among formulas like fish in the water, will appreciate me. I use LaTeX to display mathematical and chemical formulas.

Whether you're looking for a killer from a detective story in the dark streets of London, or learning about places with a long history, you can see almost every corner thanks to me (this feature is available only online in mBook).

I'll let you take a look at places you can't visit personally due to the long distance or other reasons. In this case, a virtual tour is the best solution. Provide me with the materials and my developers will create the virtual tour using JavaScript.

Do you like to create tests to check students' knowledge? With me, you can create a summary of questions with a link to the section in the book where the topic is located. I will display the link, when the question is answered incorrectly. You can choose from my test templates.

I can also insert a link to a specific downloadable file in any format for the topic being described.

Feedback is an important tool for all of us to have up-to-date information and overview. Therefore I offer the possibility to send test results to an entered e-mail.