Solar Eclipse

We took some photographs of the solar eclipse that happened on Sunday at sunset here in Tucson. If you weren't lucky enough to catch it, or if you live somewhere where it couldn't be seen, here are a couple neat photographs. We took these through a small solar-filter scope. Our neighbors provided the best view through their 10" telescope with a solar filter on it! The first photo was taken shortly after the eclipse started. The second photo is close to the full eclipse, which occurred around 6:40 pm MST.

Bubble Geometry

Steve Spangler is one of my favorite "fun" scientists. He does a segment on fun science experiments for the Denver 9 news. I wanted to share one of his experiments that I'm going to do with my preschool group next week. But first a preface...

I am used to using bubbles as a perfect segue to teaching kids of any age about surface tension and atmospheric pressure. No matter how hard they try and no matter what kinds of wands they use, the resulting bubble is always a perfect sphere! But in this experiment, Steve Spangler shows us how to make cubed bubbles. I never thought it possible until I watched his video. This is something you can do at home, and I plan to make my apparatus out of straws and balls of clay. I think Tinker Toys would also work great for this, if you have them. I'll give you an update on what materials I use after I experiment with it a bit. Meanwhile, check out this cool video from Steve Spangler's page!

"Cracking the Egg Sprinkler Mystery" on NPR's Science Friday!

While I was listening to Science Friday on the radio today, I was most intrigued by a small excerpt they included at the end about an experiment that sounded like fun! Apparently, this experiment was fueled by a scientist at BYU, who got the idea from a former professor, who got the idea from an old high school teacher, and so on and so on. You get the picture. Who knows how far all these fun experiments go back in time? No matter. The point is, they're still fun and they're timeless.

The gist of the experiment is simple, and anyone can do it, even your preschooler. You pour milk out into a puddle on your kitchen counter. Spin a hardboiled egg in the milk and watch the science unfold. The milk will literally crawl up the side of the egg and then spray out from the egg's "equator," like a miniature sprinkler system! And the mystery behind the science? Well, it's really no mystery at all if you're familiar with a man named Bernoulli. Bernoulli developed my favorite equation in the whole, wide world, which relates velocity with pressure. The higher the velocity of air or liquid, the lower the pressure. Incidentally, hydrology-minded people like myself use this equation indirectly every day, because Darcy's Law-- an equation that describes the movement of groundwater-- was derived from Bernoulli's Principle.

You can see Bernoulli's Principle in action using a hardboiled egg and various other objects on the Science Friday video at:

http://www.sciencefriday.com/video/05/04/2012/cracking-the-egg-sprinkler-mystery.html