The latest hopes are riding on a massive new skimmer to clean oil from near the spewing well in the Gulf of Mexico. TMT Shipping created what is billed as the world's largest oil skimmer by converting an oil tanker after the April 20 explosion sent millions of gallons of crude spilling into the Gulf, but lingering bad weather in the form of stiff winds and choppy seas has made that impossible. Here are some facts about oil skimmers: __