Recent research in Oxford and elsewhere has shown that one type of brain stimulation in particular, called transcranial direct current stimulation or TDCS, can be used to improve language and maths abilities, memory, problem solving, attention, even movement.
Critically, this is not just helping to restore function in those with impaired abilities. TDCS can be used to enhance healthy people’s mental capacities. Indeed, most of the research so far has been carried out in healthy adults.
The article goes on to discuss the ethics of the technique.
I'm not convinced that Algernon's Law is true in general. It might apply to improving intelligence above the currently available range, but it shouldn't apply to raising intelligence within the existing range.
Article here;
http://www.ox.ac.uk/media/science_blog/brainboosting.html
The article goes on to discuss the ethics of the technique.