The new R-naught number
There's a number used to quantify how fast a virus will spread, the R-naught number. As the coronavirus spread though out the world, we saw how the threat of infection was measured and und...
Math and Science
Genres
Grade
Measuring sea level
What does this gizmo do?
We've given students a diagram of what the interior of this mechanism contains and asked them to try to decide what its purpose must be.
Then we've...
10 Million nematodes
Nematodes
Grubs are killing my grass. I don't want to put poison into the ground. What can I do?
There are tiny roundworms called beneficial nematodes. They can kill destructive so...
What's my angle?
I'm going to help save the planet by adding solar panels to my roof!
Should I tilt the panels on my roof to more accurately aim towards the Sun?
If so, at what angle should I use?
S...
What's with the plovers?
Cute little birds. Piping plovers are nesting on beaches along the Atlantic coast. Consequently beaches are often roped-off or closed to protect their nests and chicks. Is this conservatio...
Cost of light bulbs - updated!
Algebra
Number Sense
Math and Science
Math and Social Studies
Ratio and Proportion
Data and probability
There's a lot of misinformation out there about the cost to consumers of CFL and LED bulbs and the savings in energy and money that could be realized.
Let your students "do the math" and realiz...
Bits, bytes, and nibbles
Clicking on the image will show it larger.
I'm not very good at understanding how large my device capacities are and how big the files that I want to download are in comparison. I decid...
Voyager on the edge
The two Voyager space probes are in the news recently as they approach the edge of our solar system. Scientist can tell that the Voyager's environments are changing. They are receiving m...
Happy 14th B'ak'tun!
Luckily, we’ve passed 12/21/2012 and the world is still here and we’ve made it into the start of the next Mayan calendar cycle ... the next B’ak’tun.
The ancient Mayans had an interesting...
It sure is cold out ... or is it?
Students ponder the relationship between place latitudes and average January temperatures while they try to discover a correlation. Is this a linear or near linear relationship? … averaging, mis...