A microcontroller is like a tiny computer brain that can be used to control all sorts of things, like toys, robots, and even some appliances at home. It's like the boss that tells other parts what to do. It can sense things from the world around it, like buttons being pressed or temperature changes, and then make decisions based on those things. Just like how you can tell a robot to move when you press a button, a microcontroller can be programmed to make things work in a certain way.

A mech is a large, humanoid robot that is controlled by a human pilot. Mechs are often used in science fiction and anime, but they are also becoming a reality in the real world. Exosapien is controlled by a human pilot who sits in the cockpit. The pilot's movements are amplified by the mech's hydraulic system, allowing the mech to walk, run, jump, and climb. The world's largest four-legged mech, Exosapien, is the brainchild of Canadian engineer Jonathan Tippett and team Exosapien Technologies.

Bluetooth is like a wireless messenger for gadgets. Each gadget has a tiny radio that sends secret messages in the air. These messages have codes only the right gadgets can understand. So, when your phone wants to share something, like music, with your headphones, it uses Bluetooth to send a secret code. The headphones catch the code and know what the phone wants. Then they play the music. It's like invisible chatting for devices!

The periodic table is like a big chart that organizes all the different types of elements, which are the building blocks of everything around us. Each element is like a different flavor or ingredient that makes up stuff. The table puts elements in order based on their properties and how heavy they are. Elements with similar properties are put in the same columns, kind of like grouping together things that are alike. So, the periodic table helps scientists see how elements are related and figure out how they can be used in all sorts of things, like chemicals, metals, and even things we eat!

An ultrasonic sensor is a special tool that uses sound waves we can't hear (kind of like dog whistles) to figure out how far away things are. It sends out these sound waves and waits for them to bounce back after hitting something. By measuring how long it takes for the sound waves to come back, the sensor can tell how close or far away an object is. It's like the sensor using sound echoes to find out if something is close or not.