Across the globe, cave dwellings are still used as houses. Cave homes are energy-saving, ecological buildings that provide their dwellers with an atmosphere that’s warm in winter and cool in summer. Today, throughout northern Shaanxi in China, caves are still considered the primary type of residence for citizens, especially in rural areas.

With today’s technology, we can dialogue with astronauts in space in real-time. From ancient beacon towers to relay satellites, communication technology has connected communities and made important information shareable when needed.

The Chinese invented paper, printing and the compass, but they have also been using their own refrigeration technology for thousands of years. This allowed people to store and consume food safely — and shaped modern innovations today. This story from our Host James Chau.