Low Earth Orbit debris. Credit: NASA Orbital Debris Program Office

Sawdust is a reusable byproduct of the lumber industry. Photo: Deborah Jackson / Pixabay

tweetyspics / Pixabay

NASA's Mars missions, clockwise from top left: Perseverance rover and Ingenuity Mars Helicopter, InSight lander, Odyssey orbiter, MAVEN orbiter, Curiosity rover, and Mars Reconnaissance Orbiter. Credit: NASA/JPL-Caltech

Solar farm by Christo Ras/Pixabay

Actor Joseph Jefferson as Rip Van Winkle

Computerizer / Pixabay

Mohamed Hassan / Pixabay

Sujin Soman / Pixabay

Geralt/Pixabay

Image: Gerd Altmann / Pixabay

Image by Gerd Altmann from Pixabay

Image by Colin Behrens from Pixabay

Image by Claudia Burlager from Pixabay

Image: Michael Gaida / Pixabay

Image: Mohamed Hassan / Pixabay

Geralt/Pixabay

Geralt/Pixabay

image: Goran Horvat / Pixabay

Credit: Gerd Altmann/Pixabay

Panelists, National Service: Rebuilding America's Civic Fabric, Brookings Institution, October 10, 2019.

Panelists Peter Singer, Clinton Watts, Ben Roberts, Victoria Samson, Deborah Peacock

Rebooting AI: Book Review

Edward S. Cornish (1927-2019)

Photo: Foto-Rabe / Pixabay

Image: Jan-Mallander / Pixabay

Photo: Mike McMillan, U.S. Forest Service

Google beyond search: designing the self-driving car. Image: Google Blog.

Google Car test "driver" enjoys the ride. Image: Google Blog.

Google beyond search: building the prototype self-driving car. Image: Google Blog.

Early prototype for Google's self-driving car. Image: Google Blog.

Tesla Motors' electric vehicles are charged to go. Forward momentum will rely on advances in battery technologies. Image: Tesla Motors

Candidate rooftops are evaluated for greening: Data is collected to test viability of roofs for hosting hydroponic gardens, rainwater collection systems, photovoltaic panels, and more. Image courtesy of Bay Localize.

Reef Check team members inspect health of reef ecosystem surrounding Réunion Island.