Jose Gomez-Ibanez on greater urban density and less driving

Jose Gomez-Ibanez studied the amount by which people living closer together - and driving less - can reduce the CO2 emissions to help global climate change.

Hania Zlotnik sees economic challenges for aging population

Hania Zlotnik, director of the UN population division, talks about the economic challenges for a future with an aging population, and an encouraging sign.

What makes hair curly?

Certain kinds of chemical bonds may change the shape of individual hair molecules, folding them back for an overall curly effect.

Is my car’s fuel made of dead dinosaurs?

Fossil fuels consist mainly of dead plants - coal from trees, and natural gas and oil from algae, a kind of water plant, not dead dinosaurs.

Barbara King studies ape emotions for clues on how humans evolved

"I think that people who talk about humans as very unique in terms of our emotional meaning-making should take a look at the apes," says Barbara King.

Jean Decety says bullies’ brains might work differently

Jean Decety, a neuroscientist, studies human empathy. He talked to EarthSky on his study on how children with aggressive conduct disorder process empathy.

Ardis Hoven, chair-elect of AMA, on health insurance reform

Dr. Ardis Hoven told EarthSky that her organization, of more than a quarter million physicians and medical students in the U.S., believes the health care system in the U.S. needs reform.

Do plants grow as well under artificial light?

There are some differences between sunlight and artificial light - most artificial light doesn't emit as much energy in the red and blue region of the light spectrum as sunlight does.

Harry Gray: Solar fuel cells will create fuel from sunlight

Just as plants use sunlight to make their own energy, Harry Gray says his solar fuel cells could one day create enough fuel from the sun to provide the energy humanity needs.

Drew Endy: Synthetic biology for new genetic material

Drew Endy points to the development of an antimalarial drug as a successful product of synthetic biology. And talks about future goals of synthetic biology.