Register below to join our FREE Tumbleocity Programs:

We are happy you are going to join us. Our Tumbleocity ZOOM sessions are designed by our authors to be fact filled, interactive and fun. Select the session you are interested in attending and provide us with your email info. We will send you a registration confirmation right after you sign up. The day before the event we will provide you with additional log in details. You must be 18 to register or have the permission of your parent or guardian to sign up. If you have any questions please feel free to reach us via the contact page above, but be sure and check out the Tumbleocity FAQ, as your question may already be answered. Thanks! We’re looking forward to ZOOMING with you.


July 14, 2021, 5PM ET


Mystery is in the air. A stormy Caribbean cruise, a secretive sea captain, an impending hurricane, and lots of adventure and mystery take center stage in Michael Erb’s new book The Weather Detectives. Join Michael as he dives into this thrilling weather-themed mystery. He’ll share cool weather photos, fun facts, and fascinating weather history.

For instance, did you know that someone once tried to predict the weather using living leeches? It’s true! Did you know that, over a hundred years ago on the icy continent of Antarctica, two teams raced to be the first people at the South Pole? At this event, you’ll also look for shapes in clouds, learn how to estimate the distance to lightning, and find out about weather activities you can try at home.

Author Michael Erb is an assistant research professor at Northern Arizona University, where he conducts research about the Earth’s past climate. As a scientist and author, he confronts mysteries both in his research and in a good book.

Bring your raincoat….and all your weather related questions!


Audience:  for ages 9+

Date: July 14, 2021                                                                                                                                               

Time:  5:00 pm to 5:45 pm EDT

Register:  HERE by July 12th 

Learn more about The Weather Detectives HERE.



August 5, 2021, 5PM EDT


Sharks are at the very top of the list of animals that fascinate children and adults alike, but they are usually depicted as ferocious and destructive hunters. These negative portrayals miss the point that these top predators play an essential role in maintaining the health of the world’s oceans. Sharks at Your Service highlights the positive side of sharks—as the ultimate service providers in the sea!

Join author Mary Cerullo as she explores many of the different kinds of sharks and rays and the roles that they perform in the sea — some of which even resemble jobs that humans do on land. She will use exciting video, whimsical illustrations, and dramatic photographs by the award-winning underwater photographer Jeff Rotman. Mary hopes you will see some of the things we have in common with these sea giants, and maybe it will make you want to work to protect sharks from their top predators: us!

Mary Cerullo teaches and writes about the ocean. She has written 23 books on ocean life for children, including City Fish, Country Fish (a School Library Journal Best Book of the Year), Octopus: Phantom of the Sea (a Junior Library Guild Selection), Giant Squid: Searching for a Sea Monster (an Outstanding Science Trade Book selection by the NSTA and the CBC), and The Truth About Great White Sharks (IRA Teacher’s Choice Award).


Audience:  for ages 7+

Date:  August 5, 2021

Time:  5:00 pm to 5:45 pm EDT

Register: by August 3rd HERE.


Sharks At Your Service  – get your copy HERE.  Use code “ss25” and receive 25% off and free shipping. Orders will ship after 8/5/21





April 28, 2021, 5PM Eastern Time


SPRING INTO NATURE SKETCHING – Spring is the perfect time to grab your sketchbook and get outside to look more closely at the new life bursting out around you. Sketch along with Jean Mackay, author and illustrator of The Nature Explorer’s Sketchbook, for a fun exploration of spring things, colors, and patterns. Jean will share activities and tips to get you ready to head outside this spring.

Bring paper and a pencil, colored pencils, crayons, or markers to this session. Jean will share nature objects to sketch or your can bring your own. This session is especially suited to the 8+ old artist, explorer or nature lover in your world (and adults who have wanted to try nature journaling).

 Participants will have a chance to win a copy of the The Nature Explorer’s Sketchbook and to share their artwork in the online Nature Explorer’s Gallery.

Artist and educator Jean Mackay has been exploring and sketching nature for more than 25 years. Working in all kinds of settings, from tide pools to farm fields to her own backyard in Upstate New York, Jean’s nature journals reflect a keen eye for detail and profound sense of wonder. She teaches each summer at the Hog Island Audubon Camp in Maine.


Audience:  for ages 8+

Date: April 28, 2021

Time:  5:00 pm to 5:45 pm ET

Register:  HERE by April 26th


The Nature Explorer’s Sketchbook – For The Art Of Your Discoveries – get your copy HERE.



April 7, 2021, 5PM Eastern Time

ESCAPE GREENLAND – A few years ago, author and marine scientist Dr. Ellen Prager went to Ilulissat, Greenland for research on climate change. She spent hours hiking around the KangiaIce fjord, went kayaking among icebergs, observed the Equi Glacier calve from a boat, and discovered a mesmerizing land of icy wonder. It also inspired her for the setting of the soon-to-be-released (April 1st) second book in her Wonder List Adventure series – Escape Greenland.

Join Ellen as she introduces you to the wonders of Ilulissat, Greenland, the impacts there of climate change, and as she gives you a glimpse into the fun and exciting adventures of Ezzy and Luke Skylar in the new book.

  • See and learn about the astonishing Kangia Icefjord, possibly the world’s most prolific producer of icebergs (including one very famous one).
  • Learn how whales, seals, and native Greenland dogs come into the story, and how Ezzy and Luke must deal with bullying and make decisions that could have dangerous consequences.
  • Hear about how in this tale, cold-water kayaking takes on a whole new meaning.

Ellen will share incredible images of the setting and explain why she chose it. She will also preview the Real vs Made-up section of the book to see if audience members can tell which parts of the story are based on real science and which are pure fiction.

So come join us for some frozen fun!


Audience: for ages 7 to 12

Date: April 7, 2021

Time:  5:00 PM to 5:45 PM ET

Register: HERE by April 5, 2021

To learn more about Escape Greenland go HERE.

Interested in learning more about Escape Galapagos?  Go HERE.



 If you’re interested in seeing an example of our past workshops, check out our workshop on black holes, here on our Youtube channelOr to see our workshop on puffins, click here.


Stay tuned for updates on the 2021 Tumbleocity season!

More FREE Tumbleocity programs for you.  Check back for updates.

  • Sharks at Your Service
  • Get Ready for A.I
  • The Weather Detectives