A Look into the Evolutionary Process | Through the Wormhole with Morgan Freeman | Science Channel

The video opens by addressing the universal question of life's purpose and destiny. It highlights the scientific endeavor to understand 'how we got here' and ponders whether human complexity is directed towards a greater goal. Biochemist Lee Cronin suggests that everything exists for a reason, drawing a parallel between the refinement of a traditional dish like haggis and the biological evolution of life.

Cronin proposes that the first living cell, which emerged 3.5 billion years ago, was not a result of dumb luck. He believes that a 'natural law of evolution' refined chemicals in steps over time, much like a recipe is refined through feedback. He hypothesizes that evolutionary forces were at work even before the first cell, with chemicals competing against each other.

To test his hypothesis, Lee Cronin designed a machine that simulates millions of years of chemical evolution in weeks. The machine mixes four simple chemicals in 17 million possible combinations, squirts them into a petri dish, and monitors their behavior for signs of life, such as movement, division, and vibration. Recipes showing these 'signs of life' are replicated, while others are destroyed, with small random changes introduced in each generation.

After several weeks, these chemical blobs become mobile, capture other droplets, and even reproduce. Cronin aims to evolve these droplets to feed naturally, grow, and divide, turning random chemistry into living chemistry. He challenges the notion that DNA is the only chemical capable of driving life's purpose, suggesting that evolution can occur without genetic material, with the purpose of all life forms and chemicals being to live, survive, and evolve.

Evolutionary biologist Richard Lenski embarked on the longest evolutionary experiment in history, studying E. coli bacteria for 27 years. He started with 12 genetically identical populations of E. coli, allowing them to multiply and compete for food in separate flasks. Day after day, he transfers a small sample of survivors to fresh medium, observing how they evolve over countless generations.

For the first 15 years, the E. coli populations evolved similarly. However, one night, one of the colonies experienced a dramatic evolutionary victory: it developed the ability to extract energy from a chemical additive that was previously benign. This new trait gave them a huge advantage over their competitors. Richard Lenski discovered that this mutation was the culmination of a long series of dormant mutations that had accumulated over thousands of generations.