Unique content is absolutely important. I totally commend your drive and ambition, and for only being your second blog I have to give you credit. The growth comes from the process so keep building and growing and getting feedback like this. It's obvious that English isn't your first language in your writing, so I also give you major credit for creating the content anyway. However, if your trying to reach an English speaking audience it will be essential for you to clean up the grammar and improve the overall quality of the content. I would also recommend you start by choosing a fairly specific niche in some form and grow on that. It could be science that improves our lives, but what kind of science? There is medical, technological, biological, and various other types of valuable developments in all areas of science that impact our lives every day.