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Chapter 1: What experiment did a Harvard scientist conduct with rats in 1920?
In 1920, a Harvard scientist put rats in a maze with two exits. One path was well-lit but electrified. The other was dark but safe. The rat tried the bright exit. It got shocked. It tried again. It got shocked again and again. It took 165 painful tries, but it finally learned to take the dark path. 15 years later and 30 generations later, the rats needed just 20 tries. They were getting smarter.
If the solution was passed genetically, that's not supposed to happen. A scientist in Scotland tried the same experiment with a completely different set of rats. His rats started at 25 tries, as if they already knew the answer to the puzzle. Knowledge had crossed the ocean, and no one could explain how.
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Chapter 2: How did the learning ability of rats change over generations?
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Lamarckism, or Lamarckian inheritance, is the idea that an organism can pass on skills it acquired during its lifetime, like a rat learning to avoid electric shocks, or a human learning how to throw a football. The theory is named for zoologist Jean-Baptiste Lamarck, who proposed it in 1809, and the theory is supposed to be wrong. Standard biology says that knowledge can't be inherited.
Only traits can. Eye color, intelligence, allergies. but not knowledge, not information. Harvard psychologist William McDougall tested this theory in 1920. The setup was simple, rats and a water maze. He used Wister rats, common in labs because they're genetically identical, perfect for this experiment. The maze had two ways out. One was brightly lit and easy to find. The other exit was dark.
The bright exit delivered an electric shock. The dark exit was safe. And McDougal added a twist. The bright exit moved. Sometimes it was to the left, sometimes to the right. So the rats couldn't memorize a direction. They had to learn one rule. Avoid the light.
Curse over, children. Go into the light. There is peace and serenity in the light.
Rats should naturally avoid the dark and swim toward the way out that they can see. Any animal would. You would. That's exactly what happened. McDougal's rats swam toward the bright exit, got shocked, swam back, and tried again, and got shocked again. Sometimes over 300 times. On average, the first generation took 165 tries before they learned dark equals safe, light equals pain.
Then McDougall bred the rats and tested their offspring. But he selected parents at random. He wasn't cherry picking for intelligence. He just grabbed any two rats and put their offspring in the maze to see how they behaved. According to standard biology, the new generation should start from scratch. They should average 165 tries. That's not what happened.
Generation two did better, 141 tries on average. Generation three, 118. By generation eight, rats were averaging 56 tries. That's when McDougal noticed something strange. The improvement wasn't slowing down, it was accelerating. Eight more generations, the average dropped down to 41. Eight more, down to 29. By generation 30, rats were solving the maze with just 20 tries.
What took their ancestors 165 attempts, they mastered in 20. They were eight times faster at learning the same task. McDougall tried to break the pattern. He split his colony and started breeding specifically for slow learners, taking the worst performers from each generation and mating them together. These rats should have stayed slow or gotten worse, but they got faster too.
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Chapter 3: What is Lamarckism and how does it relate to the study of inheritance?
Sometimes they're called blue caps, but technically they're... Right.
Can you please stop saying... Hey, hey, hey, we're going to be talking about blue tits and milk for a while.
We are.
Oh, baby, it's Christmas morning and Santa's been good to daddy.
Here's what the birds... Blue tits. Here's what they learned about milk. Pierce the foil cap, drink the cream. This behavior spread all over Britain. By the 1940s, they were all doing it. Every... Go ahead. Every blue tit was doing it.
Hey, do you have any stories about blue bazoombas or turquoise tatas? No. Cobalt cans, periwinkle peaks, midnight melons?
No.
Denim bundlings, sapphire sandbags?
That's enough.
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