Kevin Keach, a project administrator from St. Louis, Missouri; Bruce Borchardt, a metrologist from Washington, D.C.; Diane Siegel, an educational consultant & writer from Northridge, California.
| Name | Type | Role | |
|---|---|---|---|
| Bruce Borchardt | Guest Star | ||
| Kevin Keach | Guest Star | ||
| Diane Siegel | Guest Star |