What Makes Us Tick

Health for the Americas: Cleanliness Brings Health

Money as Debt II

Grain Harvest

Blue Sticks

Money as Debt

The Story of Menstruation

Thud and Blunder in "Knock-Off Time"

Health for the Americas: Hookworm

The Heart That Changed Color

It’s a Heart!

Balance 1950

Light Is What You Make It

Knobs in Space

Something You Didn't Eat

Defense Against Invasion

Out of the Frying Pan Into the Firing Line

Health for the Americas: Planning for Good Eating

The Grain That Built a Hemisphere

The New Spirit