Lost in the Jungle: Jack and the Geniuses Book #3 by Bill Nye
At Hank's ransacked lab, the siblings discover clues to the project he's been working on-a new way to generate and store electricity, inspired by the electric eels of the Amazon.
The kids travel deep into the Amazon jungle, following a series of clues Hank has left. Relying on genius, cunning, and new technology, the kids overcome strange creatures, a raging river, and some very clever foes to find their friend and protect his big idea.
Like volumes one and two, Lost in the Jungle features a glossary of terms and an experiment kids can do at home or at school.