I need some good ideas, well she is a girl and she loves dinasours so I thought about that theme but not comitted to itShe is very girly despite might what you might think about the dinasaours any games or decorations/favor ideas would be great.
Possibly, taking a trip to the museum in your town? I would check to see if there were any dinasours exhibts going onOr does your town have a science station? most of them have an on going eshibt in dino'sIf not, try to make a bunch of dino's pictures, or cut outsHide them around ur house, yard etc And send them on a dino's huntAnd give all the kids a prize, not just whomever found the mostGood luck.
To question a) it is because helium weighs much less than the air in a normal balloonA balloon filled with a pump contains a mixture of oxygen, nitrogen, argon and so on, much heavier than heliumUse the periodic table and see how much heavier those elements are than helium :) I
