This is a demo article. The content and images are taken from DIY Homemade Lava Lamp by EncouragePlay on instructables.com.

DIY/Homemade Lava Lamps are great fun for families to do together. It 
can be mesmerizing and calming to watch the lava lamp in action. This activity always keeps my kids busy for a good amount of time.

This is a demo K2 article. The content and images are taken from How to Make a PVC Telescope by KurtH3 from instructables.com

Placing any two convex lenses (with different focal lengths) a distance apart will create an up-side-down magnified image of far away objects.

These are instructions on how to make a simple telescope out of everyday parts (PVC pipe / magnifying lenses) using specialized 3D printed fittings to hold your lenses in just the right place