Alan Alda gives an introduction to "The Human Spark," a new series that explores the question, "What makes us human?"

In Transcranial Direct Current Stimulation, an electrical current is applied to the head and passed to the brain. Preliminary results suggest that TDCS could enhance memory and learning.

Graham Chedd tells the story of what happened at the European Synchrotron Radiation Facility, where researchers were examining Neanderthal teeth with a high-power x-ray.

While we can manipulate elaborate equations with square roots and derivatives, new research shows monkeys can “count” audible beeps and equate them to visual representations of the same amount.

How long did it take Neanderthals to grow up? Graham Chedd meets with researchers who are using a giant particle accelerator to find an answer to this question.