Teaching young students about MLK Day is very important, yet it can be difficult to explain to students how things used to be long ago when there was segregation. Read this blog post for some great ideas.
Rock Cycle [More important than you think! When picking rocks for hardscapes you want to use Metamorphic rock in most cases, especially with water (so it doesn't leach anything into the water) but it is also important to know what type of rockscape your critters may have evolved with]
Pinner: "We've Got the Whole World In Our Hands" is a lovely title for an Earth Day bulletin board display. The globe in the center is made from student handprints. The teacher typed up phrases such as: "We can pick up trash. We can plant trees and flowers. We can turn off lights when we aren't in the room." and placed these phrases around the Earth.
"I see in your eyes the same fear that would take the heart of me. A day may come when the courage of men fails, when we forsake our friends and break all bonds of fellowship, but it is not this day. An hour of wolves and shattered shields, when the age of men comes crashing down! But it is not this day! This day we fight! By all that you hold dear on this good Earth, I bid you stand, Men of the West!" - Aragorn, "The Lord of the Rings: The Return of the Kind"