Boost your career with Harvard’s 6 free online courses in AI, Python, and Web Development! Learn about the 2026 course list, duration, and how to enroll for free at pll.harvard.edu.

Regina G. Barber is a co-host of Short Wave, NPR's science podcast. Barber completed her PhD in physics at Washington State University with a focus in astrophysics, studying globular cluster systems.

“Smart” devices like TVs, speakers, and thermostats. Our cars. DNA tests we might take to learn about our ancestry. Our searches online. Along with Flock cameras and other forms of big data policing ...