Engineering is everywhere.
Start exploring.
Learn how planes fly, robots move, and everyday objects work. No experience needed — just curiosity.
Learn
Start a 5-minute lesson
StartBuild
Try a simple DIY challenge
StartPlay
Test your knowledge
StartTry this challenge
All challengesContinuous Flow Aqueous-Phase Oxidation Reactor
Design and construct a continuous flow reactor prototype that demonstrates the catalytic oxidation of a dilute methylene blue solution using hydrogen peroxide. You must define the residence time distribution for your system and achieve a minimum 70% color degradation efficiency while maintaining steady-state concentration profiles. Document the observed reaction kinetics and evaluate the influence of flow rate perturbations on your system's conversion stability.
Materials: Clear flexible tubing, small aquarium pump, syringe needles for injection ports, hydrogen peroxide, methylene blue dye, graduated cylinders, and a stopwatch.
Start a lesson
Browse all
How a Prosthetic Hand Moves
How engineers copy the body's own signals to control a robotic hand.

How a CPU Thinks (in 60 seconds)
A chip that does one tiny thing billions of times per second.

Why Bridges Don't Fall Down
The quiet battle between weight and support.

Gears: Trading Speed for Force
How spinning circles give you muscle — or speed.

How a Zipper Works
Two rows of teeth that lock — and a slider that does the magic.
How LyraVegaSci works
Read
Clear, bite-sized lessons across engineering and physics, written for curious people.
Practice
Interactive guided problems and a knowledge check make sure it actually sticks.
Try it
Every lesson ends with a DIY experiment you can build at home with everyday materials.
Translate