Better Exercise for Young and Old, and a Helicopter on Mars: Science News Quiz #10

The air is so thin on Mars that the blades had to spin 10x faster than they would on Earth. It was equivalent to hovering at 3x the height of Everest!

In the study, people who exercised with their partner were 64% less likely to hit their daily step goal of 15,000. Here's a press-release about it.

The phenomenon held true for any green space – the closer the kids' address, the stronger their bones – presumably because those kids run, jump, and play more, making their bones stronger as a result. Areas with trees were more strongly correlated with bone health than open fields, presumably because they were visited more often. (click here for the story)