- How close was the moon 2.5 billion years ago? What effect did it have? http://www.scientificamerican.com/article/earth-rotation-summer-solstice/ 6 comments askscience
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- Humans Started Riding Horses 5,000 Years Ago, New Evidence Suggests - Scientific American https://www.scientificamerican.com/article/humans-started-riding-horses-5-000-years-ago-new-evidence-suggests/ 345 comments
- A New Way to Reach Mars Safely, Anytime and on the Cheap - Scientific American http://www.scientificamerican.com/article/a-new-way-to-reach-mars-safely-anytime-and-on-the-cheap/ 187 comments
- Why is a minute divided into 60 seconds, an hour into 60 minutes, yet there are only 24 hours in a day? - Scientific American http://www.scientificamerican.com/article.cfm?id=experts-time-division-days-hours-minutes 162 comments
- The Most Boring Number in the World Is ... - Scientific American https://www.scientificamerican.com/article/the-most-boring-number-in-the-world-is/ 100 comments
- Record-Breaking Boreal Fires May Be a Climate 'Time Bomb' - Scientific American https://www.scientificamerican.com/article/record-breaking-boreal-fires-may-be-a-climate-time-bomb/ 30 comments
- We Must Stop Treating Grasslands as Wastelands - Scientific American https://www.scientificamerican.com/article/we-must-stop-treating-grasslands-as-wastelands/ 0 comments
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