Friday, November 30, 2007
Optical illusions fool us for different reasons. Some rely more upon perception than optics. For example, take the one where you are asked what color you see when the word “blue” is colored green. Our brain perceives one thing (as we read the word “blue”) while our eyes see something else (the color green). Other optical illusions, like those involving after-images, take advantage of how the eyes function.
Some optical illusions, like 3-D puzzles, rely upon how your eyes work together. If you are blind in one eye, like me, you won’t be able to see these kinds of optical illusions. (When I was younger, I had a book of illusions that suggested pointing both index fingers at each other over the bridge of your nose. Supposedly, if you pulled your fingers apart very slowly and stared straight ahead, you would soon see a small “hot dog” type image floating over your nose. Try as I might, I could never make this illusion work because it relies upon the viewer having three-dimensional vision).
If you like visual puzzles, check out the work of artists who specialize in creating optical illusions, like the late M. C. Escher.
Wednesday, November 28, 2007
The Stinkpot turtle lives up to its name by giving off an unpleasant smell when threatened or scared.
The Southern hairy-nosed wombat is native to Australia.
Townsend's big-eared bat also goes by the name "lump-nosed bat." You can check out some video of Townsend's big-eared bat in action at the Washington Department of Fish and Wildlife's BatCam.
Dung beetles actually eat the poop of other animals!
The scientific name of the Eastern spotted skunk is Spilogale putorius. The word “putorius” comes from the same Latin root as the word “putrid.” In other words, this skunk’s last name is stinky.
The Least weasel is the smallest meat-eating mammal in the world.
Check out a guide to mammals at your local library and see if you can find some even stranger names. I’d love to hear them!
[If you like this post, check out More weird animal names!]
Monday, November 26, 2007
You can try this for yourself. Make a vertical line down the center of a piece of paper and draw something on just one side. Maybe you could make half of a face (one eye, half a nose, and part of a mouth) or part of a snake or just a wild pattern. Then place the flat edge of the mirror exactly on the line. What do you notice? Is your face now whole? How does your snake look? Is your pattern the same or different?
Mylar reflective sheets make great flexible mirrors. You can find this material at specialty garden stores. Check out the cover of The Magic Mirror to see what you can do with it!
Pick up a shiny new metal spoon and look at yourself as if it were a mirror. If you are looking on the concave side of the spoon (the side you eat from), your image will be upside down. If you are looking at the convex side, your image will be right side up. You can learn about the differences between convex and concave mirrors at The Science of Light.
Visit Exploratorium to learn about making a cylindrical mirror or setting up two mirrors that seem to reflect forever.
You can also take a picture of your reflection and send it to The Mirror Project.
What’s your favorite mirror activity?
Friday, November 23, 2007
In my part of the world, the weather is finally starting to look like winter. My boys and I have been anxiously watching The Weather Channel, hoping for a snowy forecast.
So, this week’s tip of the hat goes to Snow
Wednesday, November 21, 2007
The next time you go for a walk, see if you can find a pine cone. When you pick it up, marvel at this: you may be looking at someone’s home. Some animal species – like spiders, mites, and ants – can live, eat and sleep in this microhabitat. I learned this the hard way a year ago. I was working on a craft project involving pine cones and decided to saw one in half. Soon after I began cutting, small insects started fleeing the pine cone in earnest. A good rule of thumb for crafters is to bake a pine cone in a 200 degree F oven for about 20 minutes before using it for crafts. From an ecologist’s perspective, however, I must remind you that in doing so, you might be destroying someone’s home. You may wish to study the microfauna (little bitty animals) in your pine cone instead. Check out Life in a Pine Cone if you want to examine a pine cone like a scientist. I think this would make an interesting topic for a science fair project. What do you think?
Monday, November 19, 2007
The intersection of science and the arts is a fascinating place. Over the week-end, my oldest son and I went to a performance by Bash the Trash, a group out of
Friday, November 16, 2007
Kutcher is an entomologist (a scientist who studies bugs) and has worked as a bug wrangler in over 70 movies, including Jurassic Park and two of the Spiderman movies. He likes to paint with live insects, and he is very careful to take good care of his little artists. First, he dips them in non-toxic paint and then he lets them walk across the canvas. Check out his on-line art gallery which showcases his work with flies, bees, cockroaches, butterflies, beetles, and more!
Wednesday, November 14, 2007
Monday, November 12, 2007
For the littlest scientists, take them outside and go for a walk. Stop every so often during your walk and ask, "What do you hear?" When your child answers, "A car," you can answer, "I hear the leaves moving in the wind. What else do you hear?" As your walk progresses, you can repeat these questions. A good book to follow up with is Polar Bear, Polar Bear, What Do You Hear? by Eric Carle.
For the older child (and everybody else!), I recommend this activity (based on an assignment I had in my college days, I'd give credit if I remembered the teacher!). Go outside with a sheet of paper and a pen. Make a mark in the middle of the page to show where you are. Close your eyes for a few minutes and just listen. What do you hear? When you open your eyes, mark these sounds on your paper, in the same direction that you heard them. You might have a "d" to the left of center for the barking dog to the left of you, a "c" in the upper right-hand corner of the page for the car alarm blaring up the street, and an "a" near you for the airplane flying overhead.
Wait a minute or two, then repeat the process. This time, you might have another "d" in the same place, the "a" will have moved further away, and with any luck, you won't have another "c." Keep repeating these steps until you have an "audio map" of your experience.
Friday, November 9, 2007
The Karen Beasley Sea Turtle Rescue and Rehabilitation Center.
I had the pleasure of meeting Jean earlier this year when I went on a tour of her facility on Topsail Island, North Carolina. To hear her tell it, she never intended to be a champion of the sea turtles. But in 1996, when the first injured sea turtle found her, no one else was available to care for their needs. Jean stepped up with her can-do attitude and soon her facility was overflowing with patients. When possible, Jean and her staff rehabilitate the turtles and release them back into the wild. You can see one of her patients right now on the
Jean was recently honored as
Animal Planet's Hero of the Year for 2007! Go, Jean!
Wednesday, November 7, 2007
So ... maybe it's time for a water audit. Find your latest water bill and sit the family down for a meeting. Brainstorm ways to reduce your water consumption. Don't forget to add any silly and outrageous ideas. If your son wants to stop taking baths, add that to the list. If your mom wants to eat out every night so she doesn't have to wash the dishes, write that down too.
When you have compiled a long list of possible choices, discuss your options. Which ones are workable? Which ones are likely to have the greatest impact? Take a family vote and pick your favorite. Try one water-saving idea for the next month. When your next water bill arrives, sit the family down again and see if it made a difference.
If so, keep doing that idea and add a new one. If your first idea didn't make much difference, don't get discouraged. Try another one. Check back monthly and see how much water -- and money -- you are saving.
Monday, November 5, 2007
My first thought was that someone had accidentally kicked it, or not so accidentally used it for batting practice. But when I picked up the pumpkin, it was missing a piece near the stem. How odd. Did our dog chew on it? But no, she would have eaten the whole thing!
I looked at missing portion of the tiny, ornamental pumpkin. The hole seemed like it had been made by something using small paws or very little teeth. Something had eaten my pumpkin!
We live in a suburban area, which leaves me with two likely culprits: the gray squirrel that lives in our tree and the eastern chipmunk that lives under our front step. I did a little research and found out that both animals like to eat fruit (who knew?). And pumpkins, I learned, are actually fruits, not vegetables. So far, so good.
So ... which animal ate my pumpkin? Based on the markings, I'm leaning toward the squirrel. The marks on the pumpkin look an awful lot like the ones I found on the bird feeder last year when the squirrel knocked it down. Besides, I've never known the chipmunk to steal any food from us. In addition, the chipmunk is a lot smaller and would have had a hard time knocking the pumpkin down from the porch.
For now, I've put the damaged pumpkin back in place on the front step. But I'm tempted to buy a bunch of ornamental pumpkins to see if any more of them go missing. I'd love to catch the culprit in action!
Friday, November 2, 2007
The suffix "ology" means "the study of." And you can study lots of cool science topics on this website, including ornithology (the study of birds) and ichthyology (the study of fish). Meet a volcanologist (a scientist who studies volcanoes), design a model coral reef, or cook your very own set of "cosmic cookies."
Thursday, November 1, 2007
How many colors of leaves can you count? Pick up a leaf and notice what makes it unique. Leaves are identified in part by their shapes (like round, oval, triangular) and their edges (spiky, wavy, jagged).
If you live someplace where the seasons barely change and colored leaves are rare, have your child write to a friend or relative and ask that person to send some fall leaves your way. Your child will be thrilled. One of my favorite childhood memories is of my father bringing me home colored leaves from a business trip to Boston. (Thanks, Dad!)
To dry your leaves, place a paper towel on the counter. Arrange your leaves on the paper towel so that none of them are touching. Place another paper towel over the leaves and a heavy book over that. The book will flatten the leaves and the paper towels will absorb any moisture. After a day or two, your leaves will be dry.
To make a leaf rubbing, lay a sheet of paper over your leaf. Take the side of a crayon and rub gently over the paper. A leaf shape should soon appear.
You can also take a piece of contact paper, lay the leaves on it, and lay another sheet of contact paper over them to make a placemat for the table. If you don't want a placemat, cut out the contact paper-wrapped leaves and punch a hole at the top. Let your child hang the preserved leaves around the house.