The photographer Jackie Molloy followed Tanner and David for a year and a half, during which time she took some 20,000 pictures.
Rubies and sapphires are made of the same stuff, but trace elements alter their appearances.
He helped develop two technologies that allowed people who could not use a mouse to communicate with a computer, and thus with the world.
The police, prosecutors and child welfare agencies split children from their parents every day.
One-third of patients over age 65 die in the hospital after they are put on ventilators. Doctors are beginning to wonder if the procedure should be used so often.
They hope to fight the thriving black markets for illegally logged timber.
What the implements found with the body of Ötzi revealed about the Copper Age.
Koko became an instant celebrity in her youth and charmed entertainers like Fred Rogers and Robin Williams, as well as their audiences.
The remains appear to be a new species of gibbon, and it was perhaps a pet.
Emissions of methane, a powerful greenhouse gas, are 60 percent higher than government estimates. That’s bad news for climate change.
The research did not find that viruses cause Alzheimer’s. But it showed that two types of herpes interact with Alzheimer’s-related genes and might drive the disease process.
Researchers say this is the first reliable evidence that insects can use Earth’s magnetic field for navigation.
Warming waters in the Gulf of Maine have benefited lobsters and the lobstermen who trap them. But as temperatures rise further, will the industry reach a tipping point?
As you mark the longest day of the year, consider the debate among astronomers over whether Earth’s tilt toward the sun helps make life on our world and others possible.
A branch of A.I. called deep learning has transformed computer performance in tasks like vision and speech. But meaning, reasoning and common sense remain elusive.
Two skeletons and the remains of 11 amputated limbs are leading to new knowledge of combat injuries and medical practices on long-ago battlefields.
How 727 photos taken in 29 minutes became an immersive 3D experience.
A new lobbying group is hoping to build support for a “climate dividend” plan. Its members include Trent Lott, Janet L. Yellen and Ben S. Bernanke.
As president of Merck Vaccines, Dr. Mahmoud overcame doubts in developing vaccines against two threats to women and babies: HPV and rotavirus.