Can't animate the scale of objects changing I'm trying to make a sphere go from size 0.001 to 2.000 over a course of 20 frames. When I scale it in one frame however, it stays that way for all the other frames. I can rotate it, move it, but I cant scale it

When I press i it doesn't do anything except say on the top say "successfully added 3 keyframes for keying set 'LocRot'" but that doesn't help at all.
You need to insert keyframes for changes to values.

Go to frame one, scale the object to 0.001 and with the mouse cursor in the 3d view press I > Scale. Now all frames will have this value. 
If you change to frame 20 and scale it to 200, you will notice the scale property being orange. Orange means that this value is different than the keyframed one and will be lost after changing frames.

Press I > Scale again to insert another keyframe for this value.