advancing tool technologies from stone tools to copper tools to bronze tools to iron tools to steel tools
advancing lighting technologies from tallow candles to whale oil lamps to gas lights to incandescent lightbulbs to fluorescent lights to high brightness LEDs
advancing waste disposal technologies from the open burning city dump to the land fill dump to recycling systems and sealed high temperature incinerators
advancing municipal Plumbing technologies from wooden pipe to lead pipe to steel and concrete pipe
advancing transportation technologies from sandals to horse drawn vehicles to the steam locomotive to the automobile to airplanes
advancing electronics technologies from vacuum tube to transistor to integrated circuit
advancing communication technologies from hand carried letters to government operated postal systems to telegraph to local telephone to long distance wired telephone to long distance microwave linked telephone to long distance fiber optic telephone to mobile cellphone
