Thank you so much for your detailed comment, and highlighting the gap in my content. I fully accept I have taken a huge leap from big bang to atoms, and also admit my own gap in knowledge of detail physics from big bang to atoms. I am just planning a series of short articles on Human History here, and wanted to start from the beginning of everything nevertheless. While I do hope that the information will be useful and interesting for general readers, I am also happy to see people with in-depth knowledge commenting and highlighting the missing bits! So, once again, thank you!