This article was originally published with the title “Jerrold & Beggs' Steel Springs” in Scientific American Magazine Vol. 3 No. 25new (December 1860), p. 400 doi:10.1038 ...

Apple AirPods Max Have Never Been This Cheap, Even Compared to Black Friday, Thanks to Prime Day If you're ready to see what Apple's over-the-ear headphones are like, now's the time to buy.