The heart is the vital organ that moves oxygenated blood through your body, making life possible.
From spinal stimulation to exoskeletons, technologies for overcoming paralysis have come a long way in the 10 years since Christopher Reeve died.
Humans are just the latest in a long line of hominid species that have emerged in the past six million years.
The U.S. and China produce more total e-waste than any other country, according to a new map that tracks e-waste around the world.
The IPCC's 2013 report presents the strongest case yet that humans are responsible for the changes in the Earth's environment.