Why do we yawn?
- Curious questions, Human body, Life Science
- October 17, 2014

Most flower stems are smooth and narrow, providing a long, straight path for the leaves and flowers it bears. But sometimes, if you walk through a field of goldenrod, you find something different. Some goldenrod stems have large balls on them, a little like the knob on a sceptre. That knob, or gall, is actually
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