I found this on Pinterest and am eager to try it...
MAKE MASCARA LAST 3X LONGER!! A typical mascara dries out before half of it is used. When your favorite mascara starts getting dry, add 4-5 drops of saline solution or eyedrops to the bottle. Insert your wand and stir and TA-DA!! Fresh mascara! This can be repeated 2 or 3 times until all you mascara is gone.
I wonder if this works...either way I am going to try it!!!
*This photo said it was uploaded by the user, so I don't know the original source.