There was great fanfare when the Mars Science Laboratory launched in November 2011, and again when its precious cargo — NASA's Mars rover Curiosity — touched down on the red planet in August 2012.
The eight months in between had drama of their own. Curiosity was constantly bombarded with radiation as it traveled through space — high-energy protons thrown out by the sun, and galactic cosmic rays slicing through the solar system from distant supernovas.
At a time when many people live longer, it's been a mystery why white women without a high school diploma have been dying increasingly earlier those with more education.
A study in the June issue of the Journal of Health and Social Behavior tries to understand this growing mortality gap, and finds two key factors: smoking — already well known as detrimental to life expectancy — and, more surprising, unemployment.
People who had ADHD in childhood are more likely to problems with substance abuse as adults.
But there's been disagreement about whether treatment of ADHD with stimulant medications like Ritalin reduces that risk or makes future problems with alcohol, nicotine and illegal drugs more likely.
The latest look finds that young adults who took stimulants as kids were no more likely to have substance abuse problems later than those who had ADHD but didn't take stimulant drugs. It's the broadest and deepest analysis yet, but it still leaves many questions unanswered.