the price of nymex crude at $102, up just a fraction. volatility has been the name of the game on the oil markets in recent weeks. it's caused in no small part by the iranian president mahmoud ahmadinejad. crude prices rose 2%. there was respite on thursday as royal dutch shell said it started reproduction at a nigerian oil field. good news from a different source. however, volatility is also down to u.s. threat. there we are. is also down to the u.s. threats of sanctions against iran. which is, of course, opec's second biggest exporter of crude oil. iran can control strategically