1Charles Darwin

Young Charles Darwin did not seem destined to be a world-changing figure.
He had a passion for:
- Hunting
- Beetle collecting
Dropped out of medical school, disappointing his father, Robert Darwin (a doctor).
Eventually completed a ministry course at Cambridge but never served in a church.
His transformative journey began on the HMS Beagle, a refitted ship intended for an around-the-world voyage.
Expected the trip to last two years, but it extended to five.
Key stop: Galapagos Islands, where he observed significant variations in species:
- Tortoises
- Finches
These observations were crucial but initially went unrecognized in their significance.
Returned in 1836 with substantial findings:
- 3000 pages of notes
- Over 1500 species of insects
- 4000 skins, bones, and dried specimens
- Crates full of fossils
At age 27, Darwin contemplated marriage, weighing pros and cons on paper:
- Pros: children, house care, companionship
- Cons: loss of freedom, less money for books
Ultimately decided to marry Emma Wedgwood, resigning to a quieter life but preserving imagination.

Darwin fathered 10 children and generally stayed near home, but maintained his intellectual freedom.
Spent time pondering evolutionary questions inspired by his voyage and insights on breeding:
- Selective breeding of farm animals led to new thoughts on natural selection.
Darwin's concept of artificial selection:
- Example: English horses show enhanced traits not from a single lineage but from generational selective breeding and training.
His published work, On the Origin of Species, framed the theory of natural selection:
- Random genetic changes can enhance survival.
- Individuals with advantageous traits tend to leave more surviving offspring.

Darwin's book sold out on the first day, fundamentally changing perceptions of life.
Theory of evolution by natural selection became a cornerstone of biological science:
- "From so simple a beginning, endless forms most beautiful and most wonderful have been and are being evolved."