Take everyone for a stroll down memory lane with photos of the guest of honor. Include shots from all eras, with lots of friends and family. Unify the images -- and give them classic vintage appeal -- by printing them in black-and-white.
Budding chemists aren't the only ones who will get a kick out of this enjoyable experiment that teaches something about how the natural world works. When baking soda and vinegar come into contact, they form carbon dioxide. This gas fills the bottle and can't escape, so it rushes into the balloon, causing it to inflate.