Steve Caplin, although a fan of Amazon's Alexa, wonders if it's worth building into a bicycle or a piano! He also looks at self-tightening trainers using a smartphone, the most retweeted message ever, a way of finding lost keys, a double bass that fits in a small suitcase, a solar-powered yacht and a $350,000 Swiss watch with no numbers and no hands, which chimes and gongs to tell the time.
