Help Please! I'm still stuck. Thanks!

> Please help. I haven't been able to play for awhile and now I'm stuck. Would someone please give me a big hint in what I need to do next? Below is my goal and inventory. Oh and I have a kid and a cart floating around. Thanks!
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> Your ultimate goal for the day is to get out of school. Before you do, however, you're looking to get your bag out from the classroom where you left it.
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> That is, however, not the only thing going on in school today.
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> "Agent" Laurente now has asked you to search the school for some evidence of aliens.
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> You've uncovered a major power struggle in the Chemistry Department, where Mrs. Desai is brewing a to give her full control of the lab. She's asked you to get for her gold, methanoic acid, and nitrochalk. So far you've given her the methanoic acid.
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> The teachers in the physics lab have built a time machine, and they want you to go back in time to get some "dead organic matter." All you've really learned so far is that they definitely do not want leaves.
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> Hungry Mrs. Awatif is looking for something wriggly to eat and wants you to help her out.
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> Mr. Anand over at the computer lab is having trouble with a game and is looking for your help. This is the main part of the library. There are no places to sit here, but this is where most of the books are kept. To the west is the boys' half of the library, and to the east is the girls' half. Mr. Crasto, the librarian, is here, at his desk near the entrance to the Boys' Side.
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> You're Carrying:
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> Beaker
> Chalk
> Lighter
> Scalpel
> Wire
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> Blue Paint
> Disk with Virus
> Mirror
> Shirt
> Wrench
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> Bottle Cap
> Eraser
> Perma-Tie
> Soldering Iron
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> Chain
> Glue Stick
> Photos of Fashion Show
> Syringe