Penicillin (1/5)
Helps people live longer and prolong the misery of existence. Also, misleadingly does not contain pencils.
Sex (1.5/5)
Too much tiring effort.
The Wheel (3.5/5)
Rolls pretty well. Not much use for other things.
Boats (5/5)
Poop deck.
Long black hooded robes (4.5/5)
Great for being spooky and concealing your identity from those who would harm you. Not to be confused with long white hooded robes (0/5).
Agriculture (0.5/5)
The source of all the boring things in life; root vegetables, sheep, tractors, farmers, capitalism, fields.
War (0/5)
Responsible for some truly average films.