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Period: to
Contemporary age
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Plane
It allows to carry people and things fast and over geographic accidents as mountains, swamps or sea.
Pros:
Fast.
Evade the terrain.
Safer.
Cons:
Needs hability.
Expensive.
Small (smaller than a ship) -
Nuclear bomb
Explode and kill the enemy.
Pros:
Fast war.
Stop war.
Start of nuclear energy.
Cons:
Destruction.
Radiation.
Death. -
I.a.
Artificial Intelligence, an ai is intelligent and can do what whe can't.
Pros:
Help.
Information.
Point of view.
Cons:
Destroy works.
Lazy people.
Errors. -
3d printing
Can make anything.
Pros:
Can make anything.
Cheaper.
Better in most of cases.
Cons:
Expensive machine.
Needs plastic.
Time. -
Nokia 3310
Phone to call people and personal defense.
Pros:
Call people.
Personal defense.
Games.
Cons:
Prize.
No habilities.
Light, not very defensive.