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The trigger for why leaves change color in the fall is day length, or more exactly the length of nights.
If an athlete allows sufficient recovery after suffering a concussion and before returning to play, the damage done to the brain is likely entirely reversible.
A long time ago, plant researchers found out that you can get plants to grow perfectly fine without soil if you provide water and mineral nutrition.
Cedar-apple rust is one of several plant diseases that are all caused by different species of a fungus called gymnosporangium.
Gravity is pretty much everywhere. We just feel it in different ways depending on our state of motion.