Science Games

I have to baby sit these two kids.
One is a 5 year old girl.
And the other is a very mature (likes science and rocks and stuff) 8 year old boy.

What are some games I can play with them together? Or seperat?

These games are designed to play on embedded flash player, and need some user inputs to load properly. if thers is a way to download whole content including java script and everything that necessary to play these games.

I just started tutoring in a local minority neighborhood. I know some of you will be tempted to recommend cheesy little kid games. These kids have hard lives and have been exposed to things that have gotten them past the immature games. I’m looking for games that would actually be fun for them so that they can feel like I’m actually talking with them instead of down to them.

I have 2 kids ages 8 10…1 boy and 1 girl. I’d like some suggestions for educational games to play while spending fun one on one time together. I’ve already thought of the game Memory but I’d like to get several games to keep things fresh.

Which same type of games do males and females play most? Would that be a good science project? the date due is coming soon and i got nothin else coming to my mind…