I always like to think about concrete. There is the history, the chemistry and the environmental pain of the stuff. I appreciate a well written commercial article/advertisement as you know you are getting polished spin. The next article on AI and greenhouse gases is a real tick the box guide to writing science articles. Tucked away in there is the real signs of social change as we hand over the controls to computers. MP4 recording     MP3 recording -- -- Your browser does not support the audio element.