Toyota’s Walk Me asks a useful innovation question: what if the limitation you’ve been improving around is the thing that needs replacing? Wheelchairs have been in slow evolution for a super long time. The earliest known depiction of one dates to about 525 AD, and Spain’s King Philip II had a wheeled chair built for him in 1595. The first recognizably modern folding wheelchair arrived in the 1930s. They’ve gotten lighter, faster, more comfortable and way more sophisticated. Yet their defining...