Laura danced with Miss Kate to Mozart this afternoon.

Elinor is a sunggle sweetie.

Caleb sporting his new do while wearing Collin-wear.

Miss Robin taught us about bacteria today.
She explained how we preserve foods with salt, dehydration and sometimes alcohol.

We talked about bacteria and viruses today. I told the children that I'd send you a link to show them how small they are: http://learn.genetics.utah.edu/content/begin/cells/scale/ Just move the scrubber to zoom in and make sure you zoom back out too. Very cool.

We talked about needing beneficial bacteria in us to break down food, and eating things like yogurt to add more beneficial bacteria. We discussed the food chain with bacteria being part of the decomposers and that without bacteria we would all die in one big trash heap. However, we like things decomposing after we're done with it, not before, so we discussed the science of food preservation. Here is a good article on the different methods of food preservation:

http://recipes.howstuffworks.com/menus/food-preservation.htm
You can read this article with your children while looking in your food pantry for all the different methods of preservation. Make it a challenge to find all of it...although it might be hard to find freeze dried.

For a demonstration of chemical preservatives, we also looked at the bread we used in the densities experiment for Week 7 which was October 20. I bought the cheapest white bread at Target since we weren't eating it and it still hasn't molded! It has been sitting in my kitchen for over two months. Scary. Stay tuned for the end of the year when we check back in to see if it ever will mold.

Your children also received a petri dish with bacteria that they collected from themselves or the church. Please take out the paper in the baggie and read it carefully and record your colony counts daily. Please be careful not to open the petri dish. PLEASE BRING IT BACK NEXT WEEK!! We want to compare all the fun, gross things we collected. Hmmm, is Boaz's nose more germy than a toilet seat?

Miss Robin brought a MRE in for us to try.
Brian, Bo, Elizabeth and Elinor all prayed for Major Shaw and his troops.

Miss Tiffany shows her class how a loom
works and discusses how much more efficient a power loom is.

Bo is showing off his UV bracelet.
Miss Robin taught the children about UV light using beads that absorb rays and turn colors.

Robin the Spanish Explorer.

Douglas and Justin snacking.
Apparently the best part of dissecting starfish was all of the fun
you could have posing for pictures.

Joseph.
Notice the difference between Joseph and his sister Clara, above.

Joseph, Clara and Elinor are sleeping as part of their family play. When they wake up they find Christmas presents.


Soon after being given the presents Joseph and Clara begin to fight over their gifts. Robin, their mom, explains to them the meaning of Christmas. That we celebrate Christmas to say thank you to God for allowing His Son to come to us.


Their daddy, Paul, played role of Jesus on the cross.

This was my favorite part of their family play. When Paul came back from the dead his children forgot about their play and ran to their daddy. Much like God wants us to run to Him. It was absolutely beautiful.

Paul not only crafted each of the rocket launchers for our group but he also made the projector apparatus that enabled us to see the cow eye dissection on a big screen as we worked on our individual eyes. Thank you Paul, you have blessed our group.

Dry Ice

Today's science terms and concepts:

There are 4 states of matter (Tutors, this will be in our Science grammar next semester): Solid, Liquid, Gas, and Plasma. Plasma is a really complex subject so I just told the children that stars (including our sun) is made of plasma and that is probably enough for them to know now.

Water at standard atmospheric pressure (normal pressure) which is "1 ATM" goes from solid (ice) to liquid (water) to gas (steam) as we increase temperature. However, if we increase or decrease pressure, it may behave differently. We can see how it behaves by seeing water's phase diagram. At 1 ATM, water goes from liquid to solid at 32 degrees F or 0 degrees C. It goes from liquid to gas at 212 degrees F or 100 degrees C (shouldn't we just convert to Celcius?! Much easier to remember!).

However, all materials have their own phase diagrams. Carbon Dioxide, at 1 ATM, or standard pressure, goes directly from solid (Dry Ice) to gas at around -110 degrees F. So any temperature above -110 degrees, it will become a gas. That is why dry ice is so good for putting in the fridge during power outages (should never be put in a working fridge) and mailing perishables. You won't be left with a wet mess after it melts.

At higher pressure, Carbon Dioxide will go from solid to liquid to gas. That is why soda manufacturers have to introduce high pressure in order to liquefy Carbon Dioxide to add to the rest of the junk that's in soda :).

The process for ice becoming water is melting.
The process for water becoming steam is boiling.

However, the process when you skip the liquid stage and go from solid directly to gas is sublimation. Even if they don't remember the word, they get the concept that different materials behave differently.

Dry ice precautions:

Dry ice isn't dangerous per se but it is so cold that it will kill your skin cells with very short contact, so should never be touched without thick gloves.

The gas is not dangerous but large amounts of it can asphyxiate.

Dry ice should not be put in a closed container. The gases will build up and if they can't escape, will explode the container it is in. This is just about true for any gas buildup.

Dry ice can be put in drinks to make an interesting show, but no one should drink the actual ice so it's safest to wait until all the ice is gone. And each time children should be reminded not to eat or drink science experiments without permission, no matter what they think.

Harris Teeter in Reston (near the Home Depot) has a dry ice fridge. Otherwise, it's a little difficult to find. And it usually sells out during power outages and Halloween.

Dry Ice

Rockets

Yep! There are now three bottles on the roof of the church. Oops!

ROCKETS

ROCKETS!

Electricity!

Paul, Anya, Elizabeth and Teagan learned about circuits today.

Robin explained how a circuit works and had us hold hands in a circle to demonstrate the flow of electricity. It was a little disconcerting when she then asked Robert to hold the electric line... was it going to spark him?




Grace made a light that actually lit!