Tuesday, May 13, 2014

Meet the Pollen Counters

In the news:
by Sumathi Reddy
The Wall Street Journal
May 5, 2014
Bottom-row images from left to right:
Ash tree pollen grains - stock image SA7992
©Andrew Syred/Science Source
European white birch pollen - stock image 3A0440
©Eye of Science/Science Source
Pollen of willow tree - Stock Image SN7094
Photo Insolite Realite/Science Source