Ohm vs. Amp (Alien in My Pocket Series #5)

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 into Zack's bedroom. But now it's Amp's turn to be in the hot seat. When his…