NEPM’s Carrie Healy recently stood at about 1,900 feet above sea level in Florida, Massachusetts, on a mountain in the Hoosac Range. Nearby is the central shaft. It now provides ventilation to the ...

If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...

THE observant traveler in our Northern States cannot have failed to notice, within the last few years, as the long trains of freight-cars sweep by him, bow frequently appears, lettered distinctly on ...