Self directed learners monitor their behavior and attention. Sometimes, they realize that they need to take a break and think about something else for a while to refocus. These sites/activities are good ways to take breaks and in the lab, they are the only options for brain breaks.

The following sites allow you to help good causes:
Free Rice
For each answer you get right, this organization will donate 10 grains of rice to the World Food Programme.
Free Kibble 
This site has one question for dogs and one question for cats each day. You can donate kibble to starving pets. 
Quick, Draw
Help teach a neural network to recognize pictures by adding your drawings to the world’s largest doodling data set, shared publicly to help with machine learning research.

Use your rest time to learn something new or to improve a skill.
Typing Club
Improve your typing skills. Sign up for an account and you can keep track of your progress.
Khan Academy
Learn about a topic of interest to you. 
Hello Processing
We use Processing in our programming for animations and Arduinos. Get ahead a bit by doing this tutorial. 
Sustainability Simulations
Learn about the concept of sustainability and how choices today  impact the future. 
2048
Practice math as you race to 2048.
Entanglement
Can you connect the ends of the maze?

Use your rest time to create something new.

Soundation
Mix music that you could use in a project. 

Made with Code
Check out some of the amazing things you can do with code.

PencilCodeGym
Learn professional programming languages using an editor that lets you work in either blocks or text. Create art, music, games, and stories. Or invent a program that will change the world.

TurtleAcademy
Program art with a turtle.

Scratch
You can create anything in Scratch: games, movies, animations, polls, whatever you imagine!

Tinkercad
Sculptfab
3d Slash
Vectary
Design something in 3d.