What are negative numbers?

Have you ever opened an empty box and tried to take three things out? It sounds impossible, right? For thousands of years, humans thought zero was the absolute bottom of everything! But what if there is a whole hidden world hiding beneath nothing? Join Mira and Finn on a mind-bending mathematical adventure to discover the secret underground world of negative numbers! Travel back 2,000 years to ancient China, where brilliant mathematicians used special black wooden counting rods to track numbers less than zero. Then, zoom over to India in the year 628 to meet Brahmagupta, the genius who wrote the official rules for them! But the craziest part? Hundreds of years later, some European mathematicians completely refused to believe they were real, even calling them "absurd numbers"! Learn how numbers aren't just for counting apples—they are like a giant ladder stretching in both directions forever! From freezing winter thermometers and deep-diving submarines to elevator basement buttons and the wacky scoring of golf, you will start spotting negative numbers everywhere. Get ready to go below zero and double the size of the mathematical universe!