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A geodesic icosahedron, the Times Square New Year's eve ball
A geodesic icosahedron, the Times Square New Year's eve ball

Image by kjpargeter on Freepik It's a gorgeous ball, covered with Waterford Crystal triangles, shaped as a geodesic icosahedron. Every New Year's Eve it descends in Times Square...

Geometry Math and Science
Veterans Day, 2023
Veterans Day, 2023

This activity will be updated before October, 2026. Stay tuned! On Veterans Day we honor the men and women that have served in the Armed Forces of the...

Algebra Social Studies Grades 4–HS
DST ends November 5th, 2023 - strange happenings
DST ends November 5th, 2023 - strange happenings

In this activity students try to figure out how time settings will change as they move from place to place and in the serious weirdness of Arizona and...

Algebra Number Sense Grades 4–HS
Leslie's Yummy Pumpkin Pie
Leslie's Yummy Pumpkin Pie

Every year more and more people come to our house on Thanksgiving morning for my (Leslie's)famous pumpkin pie and a hike in the nearby woods. This year 23...

Algebra Number Sense Grades 3–5
Nobel Prizes
Nobel Prizes

The Nobel Prizes have just been awarded. This is the medal that is given to the winners. What do you know about the Nobel Prize? Who do you...

Algebra Number Sense Grades 5–HS
More Population Pyramids
More Population Pyramids

The population pyramid above shows the distribution of the World by ages and sex for each continent. How can that information help you put your vision of the...

Algebra Number Sense Grades 5–HS
Indigenous Peoples or Columbus Day
Indigenous Peoples or Columbus Day

When Columbus landed in Guanahani (renamed San Salvador, Bahama Islands by Columbus), he began the European settlement of the New World. Guanahani was inhabited by the Taíno people...

Algebra Geometry Grades 4–HS
Will this be an El Niño winter?
Will this be an El Niño winter?

The Oceanic Niño Index (ONI) started to show changes to the Pacific Ocean surface temperatures in April and May of this year. Those temperatures are still rising which...

Number Sense Math and Science Grades 3–HS
Little Amal walks across the United States
Little Amal walks across the United States

With our world in so much turmoil and refugees trying to survive hardships by traveling away from their homes, the story of Little Amal is powerful, timely, and...

Algebra Number Sense Grades 4–HS
Will the Barbie movie out-perform Avatar at the box office?
Will the Barbie movie out-perform Avatar at the box office?

The Barbie Movie is still doing well in the theaters. It has only been 6 1/2 weeks since its debut. Do you think that it can out-earn Avatar?...

Algebra Number Sense Grades 2–HS
Jock tax 2023
Jock tax 2023

Great professional athletes make a lot of money. Did you know that professional athletes have to pay an amazing amount of federal, state, and sometimes even city tax?...

Algebra Number Sense Grades 5–HS
What do you know about the Hawaiian islands?
What do you know about the Hawaiian islands?

We’ve been watching news about the extreme wild fires, draught and winds that have devastated parts of the Hawaiian Islands. Let your students explore Hawaii and better understand...

Algebra Number Sense Grades 3–7