Happy #EarthDay, and thanks to math and science for all you've given us! 
March on! 🎉🔬🔭
https://t.co/tYquyVKZUn

Happy #EarthDay, and thanks to math and science for all you've given us! March on! 🎉🔬🔭 https://t.co/tYquyVKZUn

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