A mathematician and an astronomer who proposed the heliocentric theory
Heliocentric theory
Sun was stationary in the center of the universe and the earth revolved around it
Before Copernicus, the principles of classical astronomy involving the four elements were followed
Geocentric theory
Earth was put at the center of the universe
Aristotle believed that the Earth is the true center of all the orbs and that all motions are uniform and unchanging
Between 1508 and 1514, Copernicus adopted the heliocentric model, but this concept was considered a radical idea during that time
Copernicus' essay "On the revolutions of the heavenly spheres" (De revolutionibus orbium coelestium) was only published before his death in 1543 and while he was on his deathbed
Charles Darwin
British naturalist known as the "Father of evolution"
Darwin's theory of evolution
All living organisms are related and have descended from a common ancestor
Complex creatures evolve from more simplistic ancestors naturally over time and these changes occur because they aid survival, known as "natural selection"
Adaptation
Short term adjustment
Natural selection
Survival of the fittest - not necessarily the strongest or most intelligent that survives, but the ones most responsive to change
Variations in a population help in survival, and organisms that survive are better adapted, and the better adapted a species is, the more fitted it is to reproduce
Sigmund Freud
One of the 20th century's most influential thinkers, known as the "Father of Psychoanalysis"
Freud's belief
When people explain their behavior, they rarely give a true account of their motivation, not because they are deliberately lying but because they are more adept at self-deception