Alien in My Pocket #5: Ohm vs. Amp

Zack and Amp get a serious surprise in the fifth installment of this intergalactic chapter book series by Nate Ball, the host of PBS's Design Squad and Design Squad Nation. Zack and his alien friend, Amp, discover that leverage can be an Earth-saving thing when they build a rocket-launching atlatl!

Zack McGee's life has been filled with trouble since Amp, a four-inch-tall alien scout, crash-landed ...