<div class="gmail_quote">This is so cool and so sad, too...</div><div class="gmail_quote"><div dir="auto"><div><br><b>Trees Make Sounds When They're Running Out Of Water, Lab Experiments Suggest</b><br><a href="http://www.huffingtonpost.com/2013/05/02/trees-make-sounds-drought_n_3200491.html" target="_blank">http://www.huffingtonpost.com/2013/05/02/trees-make-sounds-drought_n_3200491.html</a><br>

<p><em><strong><a href="http://www.livescience.com/29177-tree-drought-sounds.html" target="_hplink">By Elizabeth Howell, OurAmazingPlanet 
Contributor:</a></strong></em></p>
<p>Like a person gasping for air when it's in short supply, living trees make 
noises when they are running out of water, and a team of French scientists is a 
step closer to pinpointing the noises.</p>
<p>Lab experiments at Grenoble University in France have isolated <a href="http://www.livescience.com/18355-ultrasonic-tarsier-call.html" target="_hplink">ultrasonic</a> pops, which are 100 times 
faster than what a human can hear, in slivers of dead pine wood bathed in a 
hydrogel to simulate the conditions of a living tree.</p><p></p><p>Researchers exposed the gel to an artificially <a href="http://www.ouramazingplanet.com/1597-10-driest-places-on-earth.html" target="_hplink">dry environment</a> and listened for the 
noises that occurred as air bubbles built up, similar to what occurs to trees 
during <a href="http://www.livescience.com/21469-drought-definition.html" target="_hplink">droughts</a>.</p><p></p><p><br></p></div></div></div>