December
The Search for Life | Dec 6, 1999

September
Floyd's Watery Wrath | Sep 27, 1999
Shaped by Life in the Womb | Sep 27, 1999

July
A Desperate Search at Sea | July 26, 1999
Shoot the Moon | July 26, 1999
Great Lake Effect | July 5, 1999
Playing the Mating Game | July 5, 1999

June
From Both Sides Now | June 14, 1999
That Genesis Moment | June 7, 1999

May
Secrets of the Cave's Art | May 24, 1999
When Teens Fall Apart | May 10, 1999
Why the Young Kill | May 3, 1999

April
The First Americans | April 26, 1999
Boys Need Not Be Boys | April 12, 1999
Thinking Will Make it So | April 5, 1999

March
Talking From Hand to Mouth | March 15, 1999
Taming the White Dragon | March 8, 1999
Understanding "Perimenopause" | March 7, 1999

February
How Low Can You Go? | Feb 22, 1999
The Real Scandal | Feb 15, 1999
Screening for Genes | Feb 8, 1999
Pluto? Try 'Trans-Neptunian Object.' | Feb 1, 1999

January
The Power of Big Ideas | Jan 11, 1999