Dear Doron, I hope you are doing well. I was looking at your website again and found your very nice talk What is Experimental Mathematics? In the talk you alluded to Archimedes, but in fact, I believe he is more significant because he wrote the first rigorous paper on his experimental method, you accurately state that the ancient Greeks tried to hide their reasoning. But in his paper The Method he explicitly states that it is easier to come up with the statements of theorems through a formal method, and then the proof is relatively easy. Another example from Greek mathematics is the well known Euclid proof that sqrt(2) is irrational. But in fact, this is more in the line of a verification. To discover this fact, one simply applies the Euclidean algorithm on 1 and sqrt(2) and see where that leads. Working geometrically, one soon sees that one get a recursion so that there cannot be a common measure (of course this comes down to the continued fraction expansion of sqrt(2)). For some reason, this is rarely taught, I can't think of an elementary reference. Best regards, -ilan