Heil Dust
 
Life cannot exist without water, oxygen, blah. And today I found out that life cannot exist without dust. =)
 
Light is scattered by dust. Without dust there would be no twilight... no blue sky... no gorgeous sunsets. Without dust, the sun's heat would cause the temperature to skyrocket. Without dust, there would be eternal drought, because rain clouds cannot form without dust as nucleation sites. Days would be intensely hot and the nights extremely cold.
 
It is dust that makes life possible on this planet.
So I've realized that dust is more than the stuff swept off the kitchen floor.
Moral: Don't underestimate dust.