Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...

Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...

Each summer, scores of sunny yellow dragonflies transform into vibrant scarlet flyers. Behind this showy makeover scientists have discovered a simple chemical reaction every bit as elegant as the ...