Assertion: cattail's seed | /r/HasProperty | quick experiment
Facets:
Source sentences:
text: In The Book of Swamp and Bog, John Eastman writes about the abundant seeds (“an estimated average of 220,000 seeds per spike”) of cattail: “A quick experiment, one that Thoreau delighted to perform, demonstrates how tightly the dry seeds are packed in the spike – pull out a small tuft and watch it immediately expand to fill your hand with a downy mass.