Which scientific discoveries have changed the world?

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James R Knaub

the wheel, the laptop computer, and concepts of gravity

Haitham Hmoud Alshibly

The writing and The fire

Artur Sergyeyev

There are too many to name, so here are just a few

Laws of mechanics (especially since Newton)
Maxwell's equations (and then electromagnetic waves etc.)
Special and general relativity (leading to applications like GPS)
Semiconductors (leading to compact consumer electronic gadgets of today)
Nuclear reactions