| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | space shuttle | NASA employees | NASA employees understand the space shuttle (STS) as an essential and intricate element of the space program. | 9 |
| 2 | bmp 1976 | NASA employees | In 1976, the NASA employees celebrated the significant event of the first human-made object landing on Mars. | 1 |