Medical leeches are still used today. If they have to sew your finger back on, they can only join the biggest blood vessels back together with microsurgery. So the finger swells up and turns purple. Leeches solve the problem by sucking out the excess blood that has no way to return to the heart.
Cooool . Nature is awesome
 
Cooool . Nature is awesome
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This light is a beast! Grandmaster LED. Wall to wall action in a 5x5. Super even coverage even into the corners. Less than 50 ppfd difference from middle to corner. Way more power than usable without CO2. Over 1500 ppfd.


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