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How much pee is in this pool?

Number Sense Geometry Math and Science Funny Wow factor
After chlorination, it has been hard to measure the quantity of pollutants in pool water.  A Canadian chemist, Xing-Fang Li, has found a marker for urine that chlorine doesn't disguise....

How old are you?

Algebra Number Sense Ratio and Proportion Wow factor
We usually give our ages in years, but that isn't very precise is it?  In this activity students find their age in days, hours and minutes.  First students take two minutes to estimate the...

What time should I wake up?

Number Sense Math and Food Holidays and Annual Events
I'm going to surprise my mom with breakfast in bed for Mother's Day. She wakes up pretty early. When do I have to wake up to pull this off?

Beijing Olympic Schedule 2022

Number Sense Sports Holidays and Annual Events Current events Data and probability
The Winter Olympics begins this week in Beijing. Wikipedia had this schedule of events. We think that there is a lot of information missing and apparent in this graphic. What can you tell, wha...

The James Webb telescope

Algebra Number Sense Geometry Math and Science Ratio and Proportion
 After launch, the telescope deployed on its 30-day, million-mile journey out to the second Lagrange point (L2). This video shows the deployment procedure, timeline, and location of the sate...

Just ONE hot dog

Algebra Number Sense Math and Science Math and Food Sports Ratio and Proportion Data and probability
A newly released nutritional and environmentally sustainable study shows that eating just one hot dog can take 36 minutes off your total healthy lifespan. How many would you have to eat to lo...

Need to rent some chaise lounges

Algebra Ratio and Proportion
Brian is in Crete and he took a picture of this sign. What do you suppose he's going to ask next? Yep.  "How much will 6 lounges and 2 umbrellas cost?"  And more ... Systems begin. ...

What is Juneteenth?

Number Sense Math and Social Studies Current events Ratio and Proportion
   You can appreciate why this is such a great celebration when you look at the stages and some of the events and dates of America moving towards freedom from slavery. In this activ...

Shoprite's solar energy goals on the African continent

Algebra Geometry Math and Science Math and Social Studies Current events Data and probability
  Shoprite is the largest supermarket chain in Africa.  The company is presently engaged in increasing their use of solar power to harness the abundant natural resource of solar potentia...

At least the days are getting longer

Algebra Number Sense Math and Science Holidays and Annual Events Current events Ratio and Proportion Data and probability
What's your guess?  How fast are the number of daylight hours changing each day?  Are the changes dramatic or subtle? Students make guesses; compute how l...
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