"Middle school readers will find out about the important world, national, and cultural developments of the decade 1960-1969"--Provided by publisher.

"Middle school readers will find out about the important world, national, and cultural developments of the first decade of the new millennium"--Provided by publisher.

"Middle school readers will find out about the important world, national, and cultural developments of the decade 1980-1989"--Provided by publisher.

"Middle school readers will find out about the important world, national, and cultural developments of the decade 1930-1939"--Provided by publisher.

"Middle school readers will find out about the important world, national, and cultural developments of the decade 1990-1999"--Provided by publisher.

"The US military is under cyberattack. Gizmo and invisible Six must discover who is behind this attack and the culprits' aim. But the mysterious hackers seem one step ahead of I-6 at every turn." -- Adapted from back cover.

"The CIA plans to retaliate against a terrorist with a drone strike. But Zumi proposes that they capture Viggo the Vulture alive to gain information. The mission takes Invisible Six into the criminal underworld's darkest corners." -- Adapted from back cover.

"As a tropical cyclone churns across the Pacific, a cargo plane carrying nuclear weapons vanishes in the storm. Bicep and Invisible Six must recover the missiles before they fall into the wrong hands. Their mission takes them to a remote US military outpost in the Pacific. But the base soon comes under attack. Can Bicep and I-6 hold off an invasion long enough for backup to arrive?"--Page [4] of cover.

"Middle school readers will find out about the important world, national, and cultural developments of the decade 1970-1979"--Provided by publisher.