Changing colors

Red cabbage juice is pretty cool. It changes color based on the pH of its environment. We got some dehydrated red cabbage juice powder in a science kit and decided to try it out. We mixed some of the powder and water in two cups, making some nice purple mixtures. We took our favorite acid and base (vinegar and baking soda, respectively) and added the baking soda to one cup and the vinegar to the other, getting bright blue and red mixtures (shown in the picture). Jr. scientist E was not impressed by the color changes, but Jr. scientist A really got into it. He immediately came up with a list of items to add to the mixture. We added baking soda to the vinegar mix, turning it back to purple (after the bubbles subsided). At Jr. scientist A's insistence, we added lemon juice, orange juice, flour, coffee, nuts, and various other things we had on hand - not a pretty mixture in the end but quite a crowd-pleaser!

Separating colors

This experiment came from friend-of-the-lab Sandy. The goal of the experiment was to show that black is made from a mixture of colors. We put a long strip of paper in a bottle so that the paper went from the bottom of the bottle, up and out the top, and down to the table top. We filled the bottle part way with water and made a thick black line on the paper above the water level using a permanent marker. By the morning, our thick black line had turned into a smearing of colors. Although Jr scientist A would clearly have liked the black to separate before our eyes, the experiment clearly sparked his imagination and he's now asking to see what other colors are made of.

More moon-gazing

We've been spending more time looking through the telescope. Jr. scientist A noticed that around bedtime, the moon is in different spots in the sky on different days. Now that we're looking at a smiley-face crescent moon (I'm sure that's the technical term for that moon phase), he's noticed that the image we see through the lens is flipped compared to what he sees without the telescope. Still having lots of fun. Jr. scientist A likes changing back and forth between our two lenses to see the "close up moon" and the "far away moon."

Peering into the microscopic world

Jr. scientist A just got a microscope (thanks Arthi and Glenn!), so we've been exploring the microscopic world. He instantly noticed that there was something very telescope-y about this new device ("it has a focus knob!"). As with the telescope, I wasn't sure how much he would be able to see through the lens, so we played the "what do you see" game. We looked at some string (top right photo), which he described as "branches" - a pretty good description. We also looked at colored sugar (bottom right photo), paper, grass, salt, sandpaper, and a few other things. Jr. scientist A had a lot of fun, but this was another one of those experiments where he had to compete with the adults for a turn!

Paper boats

After some attempts to make floating canoes with paper and glue, which inevitably sunk when the glue dissolved, friend of the lab Arthi provided us with an origami paper boat. We sailed (and sank) our boat in the bathroom sink, much to the delight of jr scientists A and E. The experiment also turned into a surface tension experiment when our paperclip passenger stayed afloat after our boat sank. Remembering back to an old experiment, we added some dish soap and watched the paperclip plummet.

Stalagmites and stalactites, take 3

Never willing to admit defeat, we've made another try at making stalagmites and stalactites. We noticed that the area around our crystal experiments was covered with crystals. It seems that the salt water evaporated in the hot sun, but was too heavy to stay in the air and condensed out. We decided to take advantage of this to try to grow stalactites. We put a mesh (a cut-out from a screen door) on top of the jar for our latest experiment, hoping it would catch the escaping evaporated salt water. We poured our crystal making materials into the jar while it was covered by the screen so some of the liquid would stay on the screen and start a layer of crystals for the rest to hang on to. We weren't able to grow stalactites with this technique, but we got an unexpected but happy result. The evaporated salt water seemed to get trapped inside the jar so we ended up with one big thick crystal that covered the bottom of the jar. Pretty cool. I want to try this in a disposable cup next time so we can easily get the crystal out to play with. It looks like we'll finally have crystals that aren't to delicate to handle.

Frozen boat

Inspired by an episode of MythBusters, we made a boat out of wet scraps of paper frozen together. We sandwiched the wet paper between two tupperware containers and put it all in the freezer. After it was frozen, we popped out the boat and set it to sail on the high seas of the bathroom sink with some brave gingerbread men, much to Jr. scientist A's delight. After a few minutes, the boat thawed and came apart. We put it back between the tupperware containers to re-freeze and sail again another day.

Moon-gazing

Jr. scientist A is really into outer space right now, and he got a telescope for the holidays. We weren't quite sure if he'd be able to look through the lens or understand what he was looking at. After a few times of me setting up the telescope and having him look at the moon, he decided he wanted to see some more earth-bound objects through the telescope. We started playing a game. I would aim at something familiar from across the apartment complex (like a decoration in his bedroom window) and ask him to tell me what he saw. He was generally able to identify what I pointed the telescope at - guess he was able to see through the telescope.

Going out to look at the moon (and some local objects) through the telescope has since become a nightly ritual. The only problem is that when there are a number of adults around, it's hard for Jr. scientist A to get a turn!

High flying fun

I swear there was a time when I could make paper airplanes that flew, but that time has clearly passed. So I got a book on making paper airplanes (recommended by friend of the lab Arthi). We were able to make a bunch of really cool airplanes (some of which actually took decent flights). Although I got this book for Jr. scientist A, I was surprised at how much fun the younger Jr scientist E had watching the airplanes fly by. She eventually started toddling over to where they fell and bringing them back for another flight. We had a lot of fun seeing how different designs and different modifications resulted in different flight patterns (I have to confess that I started making two of each design because I wanted more turns!). At some point, Jr. scientist A must have decided that the planes were flying because they were made of paper and insisted on trying to fly an (unmodified) paper bag. This isn't the first time that he's gone from observer/participant to actively guiding experiments in new directions, and I have to say I'm a bit proud of that!