Can you measure the weight of a human soul? No, but that didn’t stop Duncan MacDougall from trying.

Through simple hands-on lessons, students can follow their curiosity, get messy, and explore the world around them.

Kate Biberdorf, known as Kate the Chemist joins TODAY to share easy and fun back-to-school science experiments to try at home or school including making string slime and "hatching dinosaur eggs."Aug.

(via SciShow) Most science experiments take a few months or years, but some take a whole lot longer. Here are six of the longest-running experiments of all time, including one expected to last 500 ...