Questions:
1. should i try eb1a?
2. if i file eb1a, should i file i-140 together with I-485 etc? (i'm planning to file eb2/NIW like 1-3 months after eb1a)
3. if i file two i-140 petitions, and the one under eb1a is denied or approved later than the one under eb2/niw, can i use the I-485 petition under eb1a for eb2/niw?
4. why post-doc or researcher/professor doesn't file eb1b? is it because it requires permament employment letter? what is the difference between eb1a and eb1b?
Thank you very much!