Nothing makes Mom look cool, while not costing a penny, like the old baking-soda-and-vinegar trick (assuming you already have baking soda and vinegar in your kitchen.) This one actually cost me a whopping $2, because I found a volcano kit at a yard sale last week (it's New Mexico - we have yard sales in January.) It has been good for hours of business, because first we had to build it:
Oh, and then read the instructions.
And paint it.
And then place the dinosaurs. Because.
Then comes the exciting part! A little baking soda...
a little vinegar..
a lot of excitement!
And, if your children are weird, some vinegar-sniffing at the end. I guess his sinuses will be clear.