Scale of planets and stars - excellent video to share as an introduction for an astronomy unit. After watching this video it can lead to a planet walk to see the actual scale of how far apart the planets are.
This 3200 Year Old Tree Is So Huge It's Never Been Captured In A Single Image. "The President" is one of those trees. The giant sequoia stands 247 feet tall, measures cubic feet in volume, and is an estimated years old.