Dear Vyacheslav! We are extremely grateful for your help during the STEM project. The ideas you gave us were very useful and your advice helped us a lot to improve the quality both of the project itself and its presentation. We, with great pleasure, followed all your recommendations. Thank you for particular attention that you paid to the presentation of the product and the development of the content itself, including functions and interface. We kindly thank you for estimating our work and ideas rationally, correcting some things, improving them.