Hey @stach.pay, I just read your article and I want to comment on few things.

1. First, some sentences match closely with the contents from this slide. Please refrain from doing this and write in your own words by properly citing the source.

2. You also need to properly cite the images, hyperlinking the pixabay and Shutterstock webpage isn't enough. You can find more information here.

3. There isn't a reference section in your post, please list down every source that you used to prepare the content.

4. Most importantly, the content is too short and shallow. A STEM post must be detailed enough and also interesting for the readers. Please check out the latest distilled, where you will find some of the best posts under #steemstem tag.