Humans

Tricia Olson gave birth to her son and was back on the job three weeks later. Like most Americans, she doesn't get paid family leave, and she's among the 40 percent who don't qualify for unpaid leave.

When a team of researchers evaluated the scientific literature on brain games, they found little evidence that the products improve memory or thinking in real-world tasks.

Biodiversity archivist Cary Fowler explains how the Svalbard Global Seed Vault will prepare humans for the climate change and its effect on our environment and our food supply.

Environmental writer Emma Marris wants us to broaden our definition of nature to one that embraces urban and wild spaces in order learn to protect and care for it.

Have we entered a new age defined by humans? Paleontologist Kenneth Lacovara says there's "no doubt" that humans' impact on Earth will show up in the geological record.

At various times, life on earth has come close to being erased. Paleontologist Peter Ward explains what we can learn from previous mass extinctions.

Earth's rocks and fossils can help us understand our own species. Paleontologist Kenneth Lacovara explains important moments in Earth's history that help us recognize our place in the world.

Most potential Alzheimer's drugs are tested on mice. But rats may be a better choice because they seem to have a type of memory that's more like ours, and also are highly vulnerable to Alzheimer's.