Science Speculations: Time Travel

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

How Solar Systems Form: Puzzles and Possibilities

03/11/14 Astronomer Joan Najita explains the challenge of understanding how planetary systems are created.

Our Robots, Ourselves

02/10/16 The author of "Our Robots, Ourselves" discusses the limits of robot autonomy. David Mindell

Biodiversity in the Sixth Mass Extinction

03/19/24 A prominent biologist explains the crucial importance of biodiversity for life on Earth, and how the sixth mass extinction fractures that stability. Michael Reed.

Addressing the Threat to Earth System Boundaries

09/12/23 The breaching of most of the Earth system boundaries (ESBs) is destroying the planet and the crisis must be addressed immediately. Solutions must include justice for those who suffer displacement, health and economic impacts of the crisis. Diana Liverman

Space Debris Alert!: The Potential Impact on the Ozone Layer and Earth’s Climate

05/27/25 Thousands of satellites orbit Earth. At the end of their missions, they drop into and burn up in the stratosphere, depositing ash that contains oxides and pollutants that are affecting both the ozone layer and the planet's climate. Atmospheric scientists are working to analyze the aerosols and their worrisome impact. Daniel Cziczo

See What I Mean? Visualizing in Science

12/11/12 Visual representation is essential for the communication of science concepts and data. Bang Wong

The Youth Pill

09/10/10 What are the possibilities of extending human life and good health? David Stipp

A Potential Solution to the Methane Problem

03/29/22 An innovation attracting great interest: an abundant, inexpensive clay might be used to remove the greenhouse gas methane from the atmosphere. Desiree Plata

Carbon Capture and Storage Will Not Reduce Global Warming

02/09/24 GBH Forum Network webinar (noon ET) The extreme level of atmospheric CO2 is well beyond a “capture and storage/sequestration” solution, yet the hype persists that some clever extraction innovation will resolve the problem. Charles Harvey

Today's Featured Contributors

Featured Author

Mario Livio, Ph.D.

A well known astrophysicist who is also gifted at making science and mathematics accessible to the general public

Featured Guest

Tom Mrowka, PhD

A leading theoretical mathematician explains the crucial role of mathematics in understanding Nature