| 1 | What's out there is 2, 000 miles of unguarded frontier. | |
| 2 | But the mainstay is Ken Jenks, a physician' s assistant who is on call twenty-four hours a day. | |
| 3 | Sprinklers, garden irrigation systems and unattended hoses are not permitted at any time. | |
| 4 | Night watch also has to adjust the sail (or the spar) if winds change direction or strength. | |
| 5 | China has built its first unattended seismic monitoring station at the foot of Mount Qomolangma, the world's highest mountain. |