For STEM Friday we have a 2018 AAAS Subaru Childrenâ€™s Science Book Prize Finalist, Try This Extreme: 50 Fun & Safe Experiments for the Mad Scientist in You by Karen Romano Young and photographs by Matthew Rakola.

What is extreme about this book? It explores extreme temperatures (for example, the effect of cold on glow sticks), extreme environments (test survival skills) , and extreme animal abilities (for example, exploring the insulating power of whale blubber). It is also extremely engaging.

As we’ve come to expect from National Geographic Kids, the book is illustrated with fantastic color photographs. What makes it stand out is that it features real kids performing the experiments, and includes some of their comments, plus readers gets to meet all the kid scientists on pages 10 and 11. Seeing their peers doing the experiments draws kids in and empowers them to try some themselves.

The back matter includes all the science standards for each experiment, plus a very handy index.

For busy parent and educators, Try This! Extreme could be a real life saver. With clear step-by-step instructions and using easy-to-obtain materials, children can take the lead with these projects. Plus, it is super cool!

Age Range: 10 and up
Publisher: National Geographic Children’s Books (September 26, 2017)
ISBN-10: 142632863X
ISBN-13: 978-1426328633

Let’s do a hands-on science experiment for older kids inspired by the book:

## Soda Floating and Sinking

Imagine you are working in a restaurant. Someone has filled two taps, one with diet soft drink and one with regular soft drink. Unfortunately, no one knows which is which. The store manager doesnâ€™t want to serve the public the wrong soft drink, and the two taste similar enough that there are some questions. Should she throw out the soft drinks, or can you tell which is regular and which is diet using science?

If you know something about the density of different types of soda, you might be able to help.

Density can be calculated using the formula:

density= mass divided by volume

Materials:

• Large plastic bin, sink, or tub
• 4 unopened cans of different flavors of regular soft drink
• 4 unopened cans of different flavors of diet soft drink
• Water
• Table top kitchen scale
• Calculator

### Part 1. Observe the density of soft drink cans placed in a large container filled with tap water.

Do you expect the unopened cans of soft drink to float, sink, or stay in the middle when placed in tap water? Given that the cans likely contain an equal amount of aluminum and fluid, do you expect any differences in how the different kinds of soda will behave?

Fill a plastic storage bin, sink, or tub with tap water. Place the unopened cans of regular soft drink and diet soft drink in the water. Observe whether the cans float or sink.

(For a quick peek at the expected results, see this video)

Did what you observed match your predictions?

### Part 2. Determine the density of unopened cans of soda

1. Turn on the kitchen scale.
2. Make sure it reads zero (is tared).
3. Place an unopened can of soda on the scale.
4. Write down your data in a table like this one:
5. Record the kind of soda
6. Read and record the mass of the can in grams.
7. Locate the volume of the can in milliliters and record it.
8. Repeat steps 2-6 until youâ€™ve weighed 4 cans of regular soda and 4 cans of diet soda
9. Using a calculator, calculate the density of each.

What is going on?

Soft drinks are actually complex mixtures containing a variety of substances such as colors, flavors, acids, sweeteners, preservatives, and caffeine. For example, soft drinks contain phosphoric acid, which gives them a tangy taste. Phosphoric acid can also acts as a preservative, keeping the contents of the bottle fresh.

Which of these ingredients, if any, might explain the different densities observed? Read the nutrition facts of the regular soda and diet soda. Do you notice any ingredients that are contained in large enough amounts that they might result in the differences in density between diet and regular soda? How much of that substance is in regular soda? How much in diet?

Finally, how might you figure out which soda is which in the example described at the top?

Want more? See our growing list of children’s books with hands-on science experiments at Science Books for Kids.

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