just did a little checking on the web - according to various sites the celts invented the handsaw, the rotary mill for grain, soap, iron rimmed wagon wheels, the greek gods (according to one page they all derived from celtic dieties) the Indian Civilization (suppossedly one branch of celts became the Hindu's); faster horses; the legend of the trojan war; the domestication of apples; the italian wine industry; Judiasm;

and of course that the original inhabitants of the Americas were Celts.

They also built stonehenge and taught the Egyptians how to build pyramids.

At least that's what various websites say - and we know they couldn't put it on the web if it weren't true?