If you have children, you already know the answer.

Under lockdown, their world became digital and virtual.
All year, they’ve lived in the glare of computers, televisions, and artificial lights.
You’ve seen them grow moody, crabby, distracted.
Maybe they’ve gained some weight, too.
This, in a nutshell, is nature- deficit disorder.

But summer is here.
Now is the time to build a fort! Splash in puddles!  Read under trees!

Here are some other activities recommended by Go Green Northbrook:
Backyard Outdoor Time
Why Splashing in Mud Puddles Is Beneficial for Children
8 Awesomely Fun Trampoline Games
How to Safely Observe Wildlife from Your Home
How to Make a 3FT. Mini Ramp for Skateboarding
10 Incredible DIY Backyard Forts for Kids
The Complete Guide to Winter Backyard Activities
Benefits of Outdoor Reading
Outdoor family adventures 
America’s 25 Most Popular National Parks, Ranked
How to Plan the Perfect Picnic
Easy Ways to Get Kids Birding
10 Tips for Teaching a Kid to Fish

So, go outside! Smell the flowers! Feel the breeze! 
Then see how fast Nature-Deficit Disorder disappears!