AP sources: FAA eyes hefty fines for American   Gov't fitness efforts haven't stemmed kid obesity   January used vehicle sales in Japan fall 10% for 12th straight month+   PROMISES, PROMISES: War widows' futile fight   Round 2: Snow slams Mid-Atlantic, points north   S. Korea begins restoration of ancient city gate+   Iran says nuclear fuel deal "still on the table"   Japan-Uzbek symposium to explore Japanese culture's roots+   S. Korean 'comfort women' deliver letter, demand apology+   Key 10-year JGB yield falls on buybacks as stock gains trimmed+   Baidu posts jump in 4Q earnings as revenue climbs   LEAD: Tokyo stocks rebound on Greece rescue hopes, weaker yen+   Main events scheduled for Thursday, Feb. 11+   China exports show trade recovery on track   New York Senate expels senator over assault   UK firm gets final green light for stem cell trial   Myanmar court sentences US man to 3 years' prison   Political supporters clash in streets of Sri Lanka   Doctor says vendor may have been in rubble 27 days