Getting a midnight snack might now be easier for more than 6,000 residents in a western corner of Singapore. A local tech firm has introduced an automated convenience store for the first time. Another 17 stores are expected across the island by end-2021. Powered by robotics and artificial intelligence, the machines sell fresh eggs, vegetables and other essentials 24 hours a day. At any one time, a machine can hold up to 300 products.