How a spacecraft propelled by ion drives could deliver humanity deeper into space than ever before. Read more in our special report on deep-space exploration
Science aficionados have odd and surprising interests
The first man-made object to land on Mars arrived 40 years ago this month, and NASA's Curiosity rover should soon depart for the Red Planet. Here is a look at where humankind's many Mars landers have touched down, and where the planet betrays a history of all-important liquid water...
Two Mars missions are scheduled to launch this month. How have their predecessors fared? Find out more in Exploring the Red Planet
Answer these 11 simple questions to compare your score with worldwide data
New discoveries have focused researchers on two possible migration routes
Five steps, reflected in the maps below, could be taken to help feed the large population predicted for 2050 as well as reduce the sizeable harm agriculture imposes
What was once called the Freedom Tower should soon become the tallest building in the U.S. It will also be among the best prepared in the nation for a terrorist attack or other emergency...
A look at how much the U.S. has spent through Homeland Security since 9/11 and what the government spends on preventing deaths through public health