It's not just horizontal gene transfer that can obscure evolutionary history. Scientists have found bacteria recycling fragmented DNA from long-dead organisms. The impact on evolutionary theory could be substantial.
Good scientific approaches should converge on the truth. In secular origin-of-life studies, theories run off in all directions, often crashing into one another.
Scientists have not only made the production of induced pluripotent stem cells much more efficient, but also have made them just as capable as embryonic stem cells of being able to produce any cell type.