PEOPLE 1
PEOPLE 2
100
proved lightning is a form of static electricity
Who is FRANKLIN
100
discovered that sunlight is a mixture of colors
Who is NEWTON
200
created a scale to measure temperature
Who is CELSIUS
200
said the sun is the center of the universe
Who is COPERNICUS
300
worked out the steps of the scientific method
Who is BACON
300
planets orbit in ellipses (ovals)
Who is KEPLER
400
discovered the heart circulates blood
Who is HARVEY
400
Said the earth is the center of the universe
Who is PTOLEMY
500
Explained why a compass always points north
Who is GILBERT
500
showed gravity makes all objects fall at the same speed
Who is GALILEO
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