This unusual bicycle can expand to carry up to 180 kg (about 396 lb) of cargo at its center. Its rear wheel and drive chain fold down and out to provide extra space as needed. It’s also available with a pedal-assist electric motor to give you added momentum when carrying heavy loads.
These days, those of us in big cities take subways for granted. But in the 1860s, the idea was just being tested for the first time. London, England’s underground project wasn’t exactly easy, but its impact on urban development would be felt to this day. TED-Ed explains.