Looking for Signatures of Life on Mars

03/17/15 Was there ever life on Mars? How do scientists search for and analyze possible clues? Roger Summons

Science Speculations: Time Travel

03/15/18 How realistic is the time-travel concept and how would time machines work? David Toomey

The Biological Mind

03/27/18 The "mind" is not an isolated entity; it is connected to a physical-social environment. Alan Jasanoff

Ancient Environmental Shifts and Evolution

05/03/21 A warming climate led to the emergence of grasslands, which led to major evolutionary changes. Aly Baumgartner

Can Seagrasses Weather Ocean Warming?

06/14/21 Seagrasses feed and protect many marine species. They stabilize shorelines. They reduce ocean acidification. Can seagrasses endure ocean warming? Barnabas Daru

Earthquakes and Tsunamis

04/12/16 How ocean earthquakes generate tsunamis --and where tsunamis can occur. John Ebel

Creating and Testing Vaccines

02/15/21 The amazing mechanisms by which viruses infect cells and the challenge of developing effective vaccines. Forian Douam

Medicating ADHD: Diagnosis and the Long-Term Effects of the Medications

03/20/13 The potential danger of long-term use of ADHD drugs. Robert Whitaker

Cooler Smarter

06/28/12 A co-author of the new book from the Union of Concerned Scientists describes how individuals can substantially reduce their carbon footprints while creating a healthy lifestyle...Jeff Deyette

Power Plants and the Freshwater Crisis

06/25/13 The cooling systems of power plants use an enormous percentage of our diminishing freshwater supply. What's the solution? John Rogers

Today's Featured Contributors

Featured Author

Henrik Selin, Ph.D.

An international expert on climate change and environmental policy who emphasizes the need for global action on climate change

Featured Guest

Meet Bree Aldridge, PhD

A researcher whose discoveries about TB bacteria are widely recognized