I thought that the Nano was more or less obsolete, with only clones available, but it does still show as for sale on the Arduino site. However, the documentation on the site says:
"I2C: A4 (SDA) and A5 (SCL). Support I2C (TWI) communication using the Wire library (documentation on the Wiring website)."
And the pinout diagram doesn't show SDA and SCL at all.
I finally found ONE website (not official) that said that SDA and ACL were not on analog pins, but on digital ones. Fixed my problem.
THANKS A LOT, Arduino! Would someone PLEASE fix the docs so others don't
waste as much time as I did?