*We've only seen **the tip of the iceberg** of their amazing potential.*

> tip of the iceberg

> *Science*

> A massive body of floating ice that has broken away from a glacier or ice field. Most of an iceberg lies underwater, but because ice is not as dense as water, about one ninth of it remains above the surface.

> (The American Heritage® Science Dictionary)

> *Culture*

> Only a hint or suggestion of a much larger or more complex issue or problem. This phrase alludes to the fact that the bulk of a floating iceberg is concealed beneath the water, leaving only a small portion, its tip, visible above.

> (The American Heritage® New Dictionary of Cultural Literacy, Third Edition)

> [Dictionary.com](http://www.dictionary.com/browse/tip--of--the--iceberg)