Who is Modus Tollens?

Modus Tollens is like a detective who solves mysteries by checking if something is not true to figure out what else isn’t true.

Imagine you have a toy robot that sings when it has batteries. If the robot sings, we know it has batteries. But if the robot does not sing, then we can say for sure it does not have batteries. That's Modus Tollens in action, going from “no singing” to “no batteries.”

Let’s break it down with a rule:

• If A happens, then B happens.
• If B does not happen, then A does not happen.

In our robot example:

• A = the robot has batteries
• B = the robot sings

So, if the robot doesn’t sing (not B), we can say it doesn't have batteries (not A). It’s like a puzzle piece, when one part is missing, you know something else is missing too.

You use this every day. If your favorite ice cream is gone and the bowl is empty, you know someone ate it. That's Modus Tollens in real life!