| Subj. for recent arrivals, maybe |
| Alien's subj. |
| A.C.T. subj. |
| Basic subj. for a surgeon |
| Advanced math subj. |
| Art sch. subj. |
| Adam Smith's subj. |
| Eliot Janeway subj. |
| An Inconvenient Truth" subj. |
| A subj. of this puzzle |
| Subj. for many green card seekers |
| Math subj. with integrals |
| Frequent hoax subj. |
| Alien subj. |
| Observatory subj. |
| Rocky subj. |
| Subj. for nonnative speakers |
| Subj. with knowns and unknowns |
| Earth Day subj. |
| Emigrant's subj. |
| Tom Clancy subj. |
| Subj. of a "Delayed" sign |
| Math subj. with proofs |
| Subj. that helps people assimilate |
| Subj. of the 2005 Pulitzer-winning book "Ghost Wars |
| Darwin subj. |
| Subj. of psychological experiments with inconclusive results |
| Subj. for many newcomers |
| Frosh subj. |
| Subj. for a non-native speaker |