A postdoc has published some works that I am interested in. I have some questions about the work, and I would like to share some idea about the topic.
Is it considered polite to send the email to the postdoc and CC his PI? If I email the PI only, I might have to wait for a long time. However, the postdoc could not even be in the city. So I am not sure what is the best and politest practice.