This is the recipe I use when I need a gallon of really good bubble solution. It takes about 1 day to age, so if you need bubbles right away, just pour some detergent into some tap water. If you want really good bubbles, take the time to mix up this stuff.
Cookie mining is a fun activity that might get you thinking about what it take to mine for minerals in the Earth’s crust. Can you extract the minerals without making a mess or destroying the materials around it?