How Did the First Computers Think Without Electricity?

Imagine a big, heavy machine with gears and levers, like a giant clock. That was the first computer! It used gears to count and solve math problems without any electricity. The person who made it was called Charles Babbage, and he built something called the Analytical Engine. Instead of batteries or wires, it worked by turning gears and moving parts, just like a clock. People called it a mechanical brain because it could do calculations like humans, but much faster!