1. The recipient would read the microdot with a special viewer.

2. Each microdot is the size of a grain of sand and contains an identifier.

3. You want to leave the smallest imprint possible: a microdot.

4. Transferring secret documents during the Cold War was aided by this microdot camera that could photograph and reduce whole pages of information onto a tiny piece of film the size of a sentence period.

5. There exists an extended set of early Triassic intermediate-acid volcanics closely related to microdot gold ore in Southwestern Guangxi.