Takai Hensch, a Harvard professor of molecular and cellular biology, is researching valproic acid* to enhance learning. VPA is used to treat several conditions (see below*), but Hensch is researching the chemical's ability to provide adult brains with the plasticity children experience when it comes to learning new skills and to absorb new information.
In his research (via PubMed.gov), Hensch is focused on teaching adults perfect pitch. But the applications could enable learning in nearly any field. The expectation is an increase in how well adults can take in information in order to speed their learning of new material. When you consider how long it takes to master some specialties, this could help learners increase the speed through which they can cover material and provide extra years of work at higher levels. It would be a major breakthrough for increasing the efficiency of preparing humans for nearly all types of work.