What were scientists studying on March 13 2000?

Answer 1

That is impossible to answer. There are scientists all over the world studying all kinds of subjects, too many to list. A lot of studies would be private, as the scientists only release their work when they have completed. So there is always work going on. So at any time there are a huge amount of things being studied and some of those studies are not publicly known. That would have been the case on the 13th of March 2000. So it would be impossible to list what was being studied on that particular day.