Some of the earliest known evidence of humans living in and around southern Arizona and New Mexico has been traced to around 23,000 years ago. University of Arizona archeologist Vance Holliday discusses his finds near White Sands Missile Range and how they add to the book of human history in the region. Vance Holliday spoke with Leslie Tolbert, Ph.D. regent's professor emerita in Neuroscience at the University of Arizona.

Asteroid trackers are scanning the Earth's neighborhood to find any objects that pose a threat to our planet. University of Arizona planetary scientist Vishnu Reddy discusses a network designed to coordinate efforts worldwide to respond to potential life-threatening asteroid impacts. Vishnu Reddy spoke with Tim Swindle, professor emeritus in Planetary Science at the University of Arizona.

Researchers have found stress and trauma experienced during childhood leads to emotional and cognitive disorders later in life. University of Arizona behavioral neuroscientist Lindsay Halliday discusses how brain development is affected by our early environment. Lindsay Halliday spoke with Leslie Tolbert Ph. D. Regent's professor emerita in Neuroscience at the University of Arizona.

The Sonoran Desert region called Pinacate is often compared to other worlds in our Solar System. David Crown with the Tucson-based Planetary Science Institute explains how researchers are comparing Pinacate's ancient lava flows to photographs taken of Mars by robotic explorers. David Crown spoke with Tim Swindle, professor emeritus of Planetary Science at the University of Arizona.

Magicians have fascinated audiences for centuries. University of Arizona psychologist Eve Isham describes how magicians and illusionists use science to develop their effects and the connection with the inner workings of the mind. Eve Isham spoke with Leslie Tolbert Ph.D Regent's professor emerita in Neuroscience at the University of Arizona.

Nanotechnology is allowing scientists to go beyond the microscope to see the smallest structures. University of Arizona optical scientist Euan McLeod describes high tech tools that let us observe and analyze objects at the molecular level. Euan McLeod spoke with Leslie Tolbert, Ph. D. Regent's professor emerita in Neuroscience at the University of Arizona.

Neanderthals existed at the same time as Homo sapiens hundreds of thousands of years ago.

Scientists are finding ways to improve pictures to better align with the way our eyes see them.

Some of the most traumatic highlights in Earth's history can be found in ancient tree rings.

Dark energy can't be seen but space scientists say it can be measured through the outward movement of supernovae and galaxies.