“ Never attempt to teach a pig to sing; it wastes your time and annoys the pig. ”
Robert A. Heinlein, Time Enough for Love (1973). copy citation
| Author | Robert A. Heinlein |
|---|---|
| Source | Time Enough for Love |
| Topic | waste teaching |
| Date | 1973 |
| Language | English |
| Reference | |
| Note | |
| Weblink |
