Austin and Jake attempt to figure out the mass of the marble.

Gina and Amanda try to keep the marble from rolling off the pan.

Kayla and Kim check the new  volume of the marbles.

I don't know what Mara's writing, but Krista finds it quite humorous.

Kim measures the volume, Katie checks the mass, and Katherine records the numbers. Now that's teamwork!

Mark appears deep in thought. Danny appears devious in thought.

Ricky and Caleb are careful to record their observations.

Russell does some calculations while Ryan writes 'em down.

Allie measures the volume of her hand.

For some reason, Donavon seems amused at the volume of Jack's hand.

Aimee is amazed at how much water Jackie's hand displaces.

Another great shot of teamwork! Katherine and Kim often work well together.

Krista focuses on the task at hand.

Mark politely pauses for a picture.

Cory seems somewhat stunned by Mike's oversized hand.

"Uh, Molly? That's a lot of water. How are we going to measure all that?"

"Oh, be quiet, Amy! Your hand was just as big!"

Jamie, Olivia, and Keith relax a bit while waiting for their results.

Russell and Joe do a great job of hiding their enthusiasm for the lab, but not such a good job of hiding behind the steam. For an actor, Jake gives a less-than-convincing performance of recording results.

Wisely, Brian uses caution - and tongs - to remove the beaker from the boiling water.

Casie and Clare display their lab with pride.

Kim likes watching water boil, while Katherine finds it is more effective to hide behind her hair than the steam.

Kim & Katherine appear happier now that their water is hot enough to cause a change in the balloon.