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Superconductors' unique property of zero resistance can revolutionize power transmission and transport. However, most conventional superconductors require cooling to extremely low temperatures that can only be achieved with liquid helium, an expensive coolant. Materials scientists are now investigating high-temperature superconductors (HTSs) that can be cooled to a superconducting state by using the significantly cheaper liquid nitrogen, which has a remarkably higher temperature than liquid helium.

"Massive open online courses" -- or MOOCs -- are very popular and accessible forms of e-learning seen on platforms like edX and Coursera.

The Science of Happiness, UC Berkeley's free online edX class, uses psychology to teach you how to live a happier life by boosting social connection.

Learn about media law, economics, global warming, and more from free online UChicago classes via edX and Coursera.

You can take the University of Toronto's free online courses, from programming to psychology, through e-learning platforms edX and Coursera.

We talked to experts about what to do next, whether you want to apply again, find grad school career alternatives, or take a mental health break.

By 2029, some jobs in healthcare and tech are expected to be in high demand. Here are online degrees and certificate programs to help you get them.

The multi-course programs are offered by schools like NYU and Rice and are in marketable skills like data science, IT, and professional writing.

UMich offers many free online classes and programs through edX, Coursera, and FutureLearn. Here are 14 popular ones, from Python to public health.

We spoke to a career expert on the most important soft skills employers look for and found free or cheap online courses to learn them.

If you're interested in a data science or data analysis career, it's worth looking into online courses and certificate programs from edX and Coursera.

You can take thousands of MIT courses online for free through edX or MIT OpenCourseWare. Here are 13 standout ones, from Python to public policy.

edX has over 25 million students enrolled in its free courses, affordable online master's degrees, and professional certificate programs.

Learn everything from C+ and Python programming to designing storylines and music for your dream game.

What You Need To Know About Personal Finance

Like edX and Coursera, FutureLearn offers a wide range of free short courses, longer programs, and even online degrees from global universities.

Coursera and edX offer many free Princeton classes in topics ranging from public health to psychology.

Harvard's online Data Science Professional Certificate Program (on edX) is an affordable, fairly quick way to jump into a data scientist career.

MasterClass courses are taught by celebrities and experts. Here's how it works, the best classes to take, and how much membership costs.

Sites like edX, Coursera, Udemy, and Skillshare offer thousands of affordable online courses, certificate programs, and even master's classes.