Skip to main content

Science at home

The other night at dinner (during my internet outage), we were talking about what Eleanor and Amanda wanted for lunch the next day. Eleanor announced, "If you put salt on apple slices, they don't get brown." My immediate reaction was to tell her that her idea was silly, and that you put lemon juice on apples to keep them from going brown. Not only that, but salted apples would taste terrible!

For the purposes of education, I squelched that reaction. After all, I had never put salt on apple slices, even though I had a pretty good idea of what would happen. I asked Eleanor where she had learned the fact about apples. Her teacher had said so, at least, that's what Eleanor thought she had said. Well, the tried and true way to see if something works is to do it yourself, so I suggested an experiment.

We took 3 slices of apple (Mountaineer apples, very tasty) and sprinkled one with salt, one with lemon juice, and left one alone. The one sprinkled with salt made the paper towel around it wet, but nothing else happened before Eleanor went to bed. We decided to look in the morning.

I felt very proud of myself for helping Eleanor learn how to test things, see things for herself, do a (small) experiment with a control case... Sometimes helping kids learn is less telling them about what happens and just stepping back to see what they can figure out---that way they learn not just about apples (for example) but that they don't have to believe things that don't make sense.

And what did we learn in this case? We learned that Mountaineer apples don't get brown overnight. That, and Eleanor likes the taste of salty apples.

Comments

Unknown said…
Ha! I love what you learned. That'd happen to me--for sure. Great learning experience, though
mathmom said…
Hi Mari! Thanks for stopping by! My husband pointed out afterward that I could have taught Eleanor a lesson in the importance of having a control for the experiment, otherwise we would have thought that both methods worked. I might have mentioned that, but I definitely didn't point it out directly, Maybe next time.
Anonymous said…
Yes,I do like salt on my apples.

Ella

Popular posts from this blog

Why you should study the history of math

  Why you should study the history of math In the mid 1300s a fad made its way around Italy. Mathematicians would challenge each other to “mathematical duels”. They would post problems for their opponents to solve, sometimes along with their solutions in coded poetry. The winners would get support and funding from rich patrons, the losers would descend into obscurity. One such contest, between Fiore and Tartaglia, involved a new method for solving the cubic. In order to win, Tartaglia worked day and night to find Fiore’s method---unfortunately, Fiore did not do the same and only knew his own method and no others. (*Recall that the formula for solutions to quadratic equations of the form use the quadratic formula, Giorlamo Cardano---physician, philosopher, astrologer and mathematician---convinced Tartaglia to share his method and promised never to reveal it. Then Cardano figured out a more general method, and wanted to share it, but was blocked by his promises. Fortunately (for Cardan

Southern butter mints---vegan edition

After the last post, we started to be able to see what the fuss was about.  The ones made with twice the butter were the best candy I have ever tasted.  Ever.  So then we started experimenting.  How long do you pull it?  Longer than you think.  And then pull a minute or two after that.  Suddenly every single batch was creaming, pretty much right after we would cut them. I tried adding less than double butter and I think they taste much better (more delicate, according to one taste tester). The latest experiment we did involved using Earth Balance instead of butter.  It cooked pretty much the same as usual, although I was distracted right at the moment I had to pull it off the stove so it cooked maybe a bit longer than usual.  Amanda and I each pulled a quarter, while Luke pulled the bigger half.  Luke's really wasn't turning very fast---perhaps because it was too hot when he took it off the marble.  Mine was turning faster than Amanda's so we traded for a while.  Aman

Southern Butter Mints part 1

Some friends of ours have a granddaughter getting married (and she's a friend of ours as well) and so I agreed to help out with the shower.  Apparently this is to be a "southern" shower, full of tradition and elegance, but not too far over the top. Among things that are needed for a shower are punch with great grandma's punch bowl, sandwiches with cream cheese and green pepper jelly, and southern pulled butter mints.  "Ah, nobody can make those anymore.  We used to know someone, but the tradition needs to be passed down."  Like a fool, I said that I'd be happy to give it a try.  I suffer greatly from "I got a PhD in math, how hard could X be?" where X is something like gardening, or quilting, or cleaning, etc.  It's always harder than I think it will be. "We'll call Mrs. X who makes these, maybe she'll pass down the method.  I hope you don't hate me!"  I was actually planning on doing research online, watching a fe