Discover how your brain's 100 billion neurons communicate through electrical signals and chemical messengers, forming the biological foundation of your thoughts and feelings—all explained in accessible, 9th-grade-friendly science.

From Columbia University alumni built in San Francisco
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From Columbia University alumni built in San Francisco

**Jackson:** Hey Miles, have you ever wondered what's actually happening in your brain when you're thinking or feeling something? Like, what's going on in there at the microscopic level?
**Miles:** All the time! It's fascinating, really. Your brain has about 100 billion neurons—that's as many stars as in our galaxy—and they're constantly communicating with each other through this incredible electrical and chemical messaging system.
**Jackson:** Wait, 100 billion? That's mind-blowing! And each one connects to thousands of others, right? How do they actually talk to each other?
**Miles:** That's where it gets really cool. Each neuron has these branch-like structures called dendrites that receive signals, and a long projection called an axon that sends signals to other neurons. When a neuron "fires," it sends an electrical impulse down its axon.
**Jackson:** I've heard about these electrical signals, but there's also something about chemicals involved too, right?
**Miles:** Exactly! The electrical signal travels down the axon until it reaches what's called a synapse—a tiny gap between neurons. That's where the magic happens. The electrical signal triggers the release of chemicals called neurotransmitters that float across the gap and activate the next neuron. It's like a relay race happening at lightning speed!
**Jackson:** That's incredible. So all our thoughts, feelings, and memories are basically patterns of these neurons firing and communicating with each other?
**Miles:** You've got it! And what's even more amazing is that your brain isn't just neurons. There are actually other types of cells called glia that support and protect the neurons. Let's dive into how this whole system works together to create everything that makes you, well, you!