Hmmm..."science" is a pretty broad subject! I think your idea of experiments could work...beakers, bunsen burners, test tubes, etc. Could be fun!
goggles, test tubes, beakers, tweazers, lab table, microscope, frog in a jar (ICK!), this could be a really fun cake to do especially for an 8 year old boy!!! Have fun and post your pics!!!!!!!!
Two things come to my mind, 1- microscope. 2- peroidic table. I figure he might not get the table one, but microscope would be cool. 
EWWWW, I love the dissected frog idea!! My science fair project in 9th grade was dissecting a cow eyeball, talk about ICK!!!!!!
THis was for my son so I had a bit more control, but I got mini test tubes and beakers from the local teacher supply strore, filled them withdifferent types of candies and had them spilling over the cake. He asks for the same thing every year because it allows him new science supplies.
Kinda takes the "yum" out of the cake huh??? tee hee hee
Here's a great website with fantastic science experients and wonderful science supplies on it. You can buy extra large test tubes and other fun items. Steve Spangler is the guy who invented the famous "Mentos and Diet Coke" trick! I'll bet you'll find some great ideas on his website.
www.stevespanglerscience.com
By the way, so far this year I've volunteered to help in 9th grade Biology lab to dissect bullfrogs, HUGE rats, and fetal pigs! I'm the ONLY parent who has ever volunteered to help in Biology lab! I'm not sure what the other parents are really afraid of...maybe the teenagers?
My daughter made a 3D Cell of a cake last year for her science class. they all had to make a 3d cell of whatever materials. We used a round cake with a cupcake on top for the nuculeus and candies for most of the other parts. Some of them she used bc with the 104 tip to do parts. I can't remember the names but you can get a pic of a cell online from a web site.
She got an A
Search in the galleries under "Mad Scientist"
i could swear i saw a disected frog cake somewhere. it was so gross an 8 year old would love it
I don't know about the dissection ideas..... I'd have a tough time eating it - and if you have any kids that are animal lovers you may have some that are really upset over it.... especially young kids.....
however, I love the beaker idea and the one w/ the small test tubes and candies spilling out all over.... You could do a big beaker thing and then have some fondant or gumpaste "splashes" coming out of it...... or how do they do that volcano cake you used to see on TV? That would be cool if you made it beaker-like and then they could add vinegar or whatever and have stuff "bubble up" out of the cake..... I'm not quite sure how that works but I always thought that commercial looked like it had some cool ideas.....
Ooh I think one had some dry ice that they put in a little container inside of the cake.... that could be cool too if you had a little "experiment" area w/ the dry ice coming out of it........ ooh I can't wait to see your pictures!
At the dollar store where we live they have gummy bugs in a package....I think it has 6 of them. When I think about everything everyone suggested....I imagine a large sheet cake covered to look like the periodic table with a microscope on top....a couple of spilled beekers or test tubes (with different neon colored frostings) some bugs in a jar or a gummy frog...and maybe even some small books about science (like some of the science masters like Einstien).....MAYBE the sheet cake could be a book....
Just spouting off....hope it helps!
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