This is the EASIEST and one of the oldest science experiments out there, I chose to glam it up a bit for my toddler to play with, and to potentially learn how buoyancy works, so far it's just fun to make him dive and surface, and I have to admit, I've played with this as much, if not more than she has, my husband even wanted to make one so he could play with one too!

Step 1: Go to the Fishing Section

Get a fishing lure squid, bonus! Most of them glow in the dark, they are really easy to find!

Sounds cool. I might try it!
Pretty! If you fill the bottle with 1/2 vegetable oil and the other half part water, you get a weird kind of &quot;membrane&quot;, on which your octo will bump.<br><br>Lovely I'ble!<br><br>Y.
I put sparkles in it and my daughter was over the moon, I'll have to try the oil, it sounds disgusting and awesome all at the same time!

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More by danica:make a cartesian diving squid in a bottle Happy Home for our friends the Mason Bees! 
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