Opportunity cost - Wikipedia, the free encyclopedia

You can learn a lot at Wikipedia. For instance,...

Opportunity cost is the cost (sacrifice) incurred by choosing one option over an alternative one that may be equally desired. Thus, opportunity cost is the cost of pursuing one choice instead of another. Every action has an opportunity cost. For example, someone who invests $10,000 in a stock denies oneself the interest that one can earn by leaving the $10,000 dollars in a bank account instead. Opportunity cost is not restricted to monetary or financial costs: the real cost of output forgone, lost time, pleasure or any other benefit that provides utility should also be considered.

Opportunity cost is a key concept in economics because it implies the choice between desirable, yet mutually exclusive results. It has been described as expressing 'the basic relationship between scarcity and choice.'

View the full entry about opportunity cost on Wikipedia.

Earthquakes Magnitude Scale and Classes

Very early this morning here in St. Louis, Missouri, we experienced a Magnitude 5.2 Earthquake (Google Earth). Then later in the day we experienced an aftershock of magnitude 4.5.

Would you like to learn more about Earthquakes Magnitude Scale and Classes? Visit the UPSeis: an education site for budding seismologists.

60 Minutes Report - Return Trip: Back to the Moon

This video report and the several that are linked from it caught my ear. Mostly, it was the following colorful tagline that opens the story.

You may not know it, but the journey to send humans back to the moon --and beyond-- has already begun.

Hear more at Yahoo! Video - Return Trip: Back to the Moon. Although one piece of sad related news is that the space shuttle program is being retired. However, it is being replaced by a new program.

Spitzer Space Telescope - NASA

This handout photo received on February 12, 2008 shows newborn stars as they peek out from the Rho Ophiuchi star-forming region in this image from NASA's Spitzer Space Telescope. Planets resembling Earth can be found orbiting many sun-like stars in our galaxy, increasing the prospects of finding extraterrestial life on some of them, according to a study released Sunday. (AFP/NASA-HO/File)

Space is amazing! The possibilities of what is out there are limitless. See Print Story: Yahoo! News - Yahoo! News Photos.

What Kind of World Do You Want?

Would you consider placing info about this on your website? Autism numbers are skyrocketing and these children need all the help they can get.

I want to thank my mom for sending me this link and the description to go along with it. Since the money involved sounded a little hard to believe, I checked Snopes.com, and it turns out that it's legitimate.

The band, Five for Fighting, is generously donating $0.49 to Autism Speaks for *each time* this video is viewed. The funding goes toward research studies to help find a cure for autism. When you have a moment, please visit the link below to watch the video and pass it along to your loved ones. They are aiming for 10,000 hits, but hopefully we can help them to surpass this goal.

Help Five for Fighting Change Her World.

Norad Tracks Santa 2007

As they have done every year for more than 50 years, NORAD is once again tracking the Christmas Eve voyage of Santa Claus. He is soon to arrive at our house as I write this as the map shows him at Peoria, Illinois. But ... oh wait, the map just updated!

NORAD Tracks Santa - St Louis, MO

Here he comes. I've gotta go!

Want More Information?

• Start here - NoradSanta.org
• Norad - Read About Santa
• Read an article in the National Ledger about NORAD and Santa
• Learn more about NORAD on Wikipedia
• Check the schedule to see an Episode of "Weird U.S." called "It's a Wonderful Time to Be Weird"
• Scientists Marvel at Santa's Stamina

ReadWriteThink

Here is a good resource for both teachers and students alike.

Providing educators and students access to the highest quality practices and resources in reading and language arts instruction.

Visit ReadWriteThink.