Ken Ham has some of the dumbest arguments, I often don't know whether to laugh or cry. This week, the argument is essentially because science has changed, and the Bible hasn't, the Bible is more reliable.
An evolutionist could look at this chart and say, "See, scientists are continually studying the data and refining their answers, so we now have the age of the earth and dinosaurs narrowed down." We agree that scientists should continually refine their views as new information becomes available, but that is precisely the problem when it comes to this topic. Evolutionary scientists have changed "common knowledge" multiple times over the past century, yet the Bible has not changed. It still clearly teaches that the universe, earth, and dinosaurs were made during a six-day period about 4,000 years before Christ.PZ Myers has a more thorough breakdown that I recommend reading, but this got me thinking about how even a broken clock is correct twice a day (assuming we are using 12-hour time). What is often not pointed out is how a working clock may never be correct! Think about it — if I have a clock that keeps perfect* time, but it is a minute off from the actual time, it will always be off by a minute. So which clock would you rather have? The one that's correct twice a day or the one that's never correct?
Of course, my analogy is flawed. The Bible is just flat out wrong on the issue of the age of the earth (it's not and is never correct) and science works at getting closer to the correct answer. Yet, the larger point I am trying to make is that I'm not going to go with a source just because it may happen to be right once in a while nor because it is consistent/unchanging. If it is a choice between a source that randomly guesses and a source that does actual investigative work to influence its guesses, I'm going with the source that investigates even if the former is correct more often than the later.
* Which isn't really a thing...time is relative. But maybe one could say "perfect relative to the location"? All else I'll say is I didn't want to dive into the philosophy of time on this post.