Thanks, that was an interesting article. I was a little surprised that in his discussion of Indian philosophical exchange with the Mediterranean, all of the works he cited were so old. I haven't read it (though I bought it - hey, the kindle version is only $3.03 for some reason), but I'm pretty sure The Shape of Ancient Thought
by McEvilley establish that there was a lot more cross-cultural interchange than previously thought.
And then there is Pyrrhonism: How the Ancient Greeks Reinvented Buddhism
. . .
" . . . a number of early Greek philosophers are reported to have traveled widely in the east, including Thales, Solon, Lycurgus, Cleobulus, Pythagoras, Eudoxus, and Democritus (who hailed, like Ascanius, from Abdera, and, according to Philo of Athens, was the philosopher of whom Pyrrho was `most fond'). Most of these figures went to Egypt and Persia (where they might have met Indians at court, in the markets, or at the temples), but Pythagoras and Democritus, at least, are said to have gone all the way to India before Pyrrho. Plutarch tells us of at least one report, by a certain Aristocrates, recording the voyages of Lycurgus `into Spain, Africa, and the Indies, and his conferences there with the Gymnosophists.' Herodotus gives us our account of the voyage of Scylax to India, and tells us that `the number of Indians is greater than any other people I know of.' These and likely other possibilities for contact and transmission of ideas seem to have existed very early on, as we have noted, and it would seem hardly surprising that Aristotle, who had one of the earliest and largest private libraries, might have been familiar with the quadrilemma from some early source he does not acknowledge."