Hi Pablo, I think you are doing things in the wrong order. Read something, and evaluate the main idea. Give your thoughts about it. Read something involving technology that interests you. Just write something about one article.
If you repeat that process with an article involving health, you will have written 2 paragraphs.
Look at the paragraphs and ask yourself what idea they give you when you consider them together.
Follow that process, and you will come up with a great thesis statement!