How do you complete Questionaut

Play all 8 levels (stages), which ask questions about 8 school subjects. You have to answer questions correctly to get bubbles (fuel). Correct answers get one bubble and incorrect answers lose one. You need 5 bubbles to advance to the next level. (There are always some very easy questions included in the random selection.)

Start stage - click the hat and the bubble carries it away, inspiring the Questionaut to follow it in his balloon.
Stage 1 (writing and essays) - Click the pages at lower right, unplug the lamp, and click the owl to get questions.
Stage 2 (math) - Click the tree to bring out *all* of the stems and blossoms. The number bees will fly out. Click the beekeeper to ask questions.
Stage 3 (biology and physiology) - Click in order: the cat's tail, the hole in the tree/the bird there, the worm, the flower, and the owl.
Stage 4 (geometry and units of measure) - Use the dangling key to open the first drawer (soccer ball). Use the key under the mouse to open the second drawer, which has a box. Click the box to find the next key. Open the drawer that has the glass of juice, and the mouse will drink it. Click him to ask questions.
Stage 5 (chemistry) - click the icicle at lower right, and place it in the beaker. Turn the gas valve left (counterclockwise) twice, click the matches, remove one, strike it on the box, then click to light the burner. The fan opens the plug and the skater comes out. Click him when he is near the pole to get questions.
Stage 6 (probability, statistics, and graphs) - on the small windows, change the colors in order as shown on the satellite dishes: 4 red, 3 blue, 2 green, 1 yellow
Stage 7 (physics) - Grab the battery and place it in the holder at left. Grab the battery and place it in the holder at left. Click the single bulb (top) and screw it in. Click the switch to leave only that bulb on.
Stage 8 (grammar and English) - Click to remove the red cover, and hang it on the other hook. Take the faucet wheel and place on the spigot, turning it to stop the flow of words.

At the Moon: click the hat.