Chopsticks and smartphone app help Chinese detect bad cooking oil

With about 3.5 million tons of illegally reprocessed cooking oil returning to dinner tables each year, Chinese consumers are desperately looking for an easy way to help them determine if the oil they use is safe. Baidu, China’s largest internet search company, says it has found a way: chopsticks fitted with sensors that can be connected to a smartphone app to give users analysed readings.