Confirmed: There's Water On Mars
Analysis of the first scoop of topsoil picked up by NASA's Curiosity rover reveals a composition that includes two percent water. It could mean one less worry for future human visitors.
What's the Latest Development?
A sample of Martian topsoil scooped by NASA's Curiosity rover last year and put into its onboard chemical laboratory has been found to contain water in quantities totaling two percent of its composition. The lab, named Sample Analysis at Mars (SAM), used several instruments, including a mass spectrometer, to determine the makeup of the sample after it had been heated to just over 1,500° Fahrenheit. In addition to water, the sample contained perchlorates, which are toxic to humans but could be used as an energy source by certain kinds of microbes, further extending the possibility of life. Several papers describing Curiosity's findings were recently published in Science.
What's the Big Idea?
The data collected by SAM and Curiosity's other instruments "greatly advance our understanding of surface processes and the action of water on Mars," says SAM principal investigator Paul Mahaffy. Two percent of water may not seem like a lot, but for future missions, it could mean a great deal, says paper lead author and Rensselaer professor Laurie Leshin. "When we send people, they could scoop up the soil anywhere on the surface, heat it just a bit, and obtain water."
To create wiser adults, add empathy to the school curriculum.
- Stories are at the heart of learning, writes Cleary Vaughan-Lee, Executive Director for the Global Oneness Project. They have always challenged us to think beyond ourselves, expanding our experience and revealing deep truths.
- Vaughan-Lee explains 6 ways that storytelling can foster empathy and deliver powerful learning experiences.
- Global Oneness Project is a free library of stories—containing short documentaries, photo essays, and essays—that each contain a companion lesson plan and learning activities for students so they can expand their experience of the world.
Philosophers like to present their works as if everything before it was wrong. Sometimes, they even say they have ended the need for more philosophy. So, what happens when somebody realizes they were mistaken?
Sometimes philosophers are wrong and admitting that you could be wrong is a big part of being a real philosopher. While most philosophers make minor adjustments to their arguments to correct for mistakes, others make large shifts in their thinking. Here, we have four philosophers who went back on what they said earlier in often radical ways.
Numerous U.S. Presidents invoked the Insurrection Act to to quell race and labor riots.
- U.S. Presidents have invoked the Insurrection Act on numerous occasions.
- The controversial law gives the President some power to bring in troops to police the American people.
- The Act has been used mainly to restore order following race and labor riots.
Got any embarrassing old posts collecting dust on your profile? Facebook wants to help you delete them.
- The feature is called Manage Activity, and it's currently available through mobile and Facebook Lite.
- Manage Activity lets users sort old content by filters like date and posts involving specific people.
- Some companies now use AI-powered background checking services that scrape social media profiles for problematic content.
Researchers from Japan add a new wrinkle to a popular theory and set the stage for the formation of monstrous black holes.