IEEE Spectrum is the flagship publication of the IEEE — the world’s largest professional organization devoted to engineering and applied sciences. Our articles, podcasts, and infographics inform our readers about developments in technology, engineering, and science.
Enjoy more free content and benefits by creating an account
Saving articles to read later requires an IEEE Spectrum account
The Institute content is only available for members
Downloading full PDF issues is exclusive for IEEE Members
Access to Spectrum's Digital Edition is exclusive for IEEE Members
Following topics is a feature exclusive for IEEE Members
Adding your response to an article requires an IEEE Spectrum account
Create an account to access more content and features on IEEE Spectrum, including the ability to save articles to read later, download Spectrum Collections, and participate in conversations with readers and editors. For more exclusive content and features, consider Joining IEEE.
Join the world’s largest professional organization devoted to engineering and applied sciences and get access to all of Spectrum’s articles, archives, PDF downloads, and other benefits. Learn more →
IEEE Members receive 12 print issues of IEEE Spectrum and enjoy PDF downloads, full access to our archive
with thousands of in-depth articles, and other exclusive content and features.
today for 2023 and save 50%!
Zac Vawter, who lost his right leg in a motorcycle accident, celebrates with his father after becoming the first person to complete the 103-story climb to the top of Chicago’s Willis Tower wearing a bionic limb. He just has to think about moving and sensors in the 4.5-kilogram bionic leg pick up signals his brain sends to the amputation site. The high-tech prosthesis takes it from there, coordinating the movement of motors at the knee and ankle to produce a smooth gait.
If you are viewing this page with an iPad or iPhone, click here to launch the slideshow:
Willie Jones is an associate editor at IEEE Spectrum. In addition to editing and planning daily coverage, he manages several of Spectrum's newsletters and contributes regularly to the monthly Big Picture section that appears in the print edition.