Perhaps, the answer is "not very"; it may be advanced enough now.
But, one may "lead a horse to water", but still it won't "drink".
If one thinks the science of humans is possible and one develops a science, do you really think "only we" can do it? (You can not believe, which is common, OR you can set yourself up to fail to develop a science, which is common, _OR_ what "we can do", " 'they' can do".)
[ You really did/do not think we are that 'smart' did/do you ?? (Don't worry, we're in charge -- for now; on the other hand, "how's this workin' out for us"?) ]
**FOOTNOTE (added 9:45 CST 03-14-2017) in response to a question: You can take my use of "understand" HERE to mean: 'able to replicate'.
[ Off-Topic NOTE to reseachgate.net users: I almost always have to come back to a post about a day later to take care of very strange additions and deletions to the Topics a post is placed under -- most assuredly we have one 'bad robot' here. (After redoing the Topics, about a day later -- so they are reasonable -- they then seem to stick. ) (I have informed researchgate.net twice over the last several weeks.) ]