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Why does everything turn yellow in spring? Pine trees produce yellow pollen every year at this time. This annoying ritual is necessary for pine trees to reproduce. Part of the "Seasonal Science" series.
Runtime: 2 minutes
Seasonal Science: Asian Tiger Mosquitoes
Seasonal Science: Hibernation Myths
Seasonal Science: Hurricane Season
Seasonal Science: Pine Pollen
Seasonal Science: Venus Flytraps
Seasonal Science: Thundersnow
Seasonal Science: Raptor Migration
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