Due to the recent circuit breaker measures, most of us have to work from home. With the perpetual summer heat that Singapore has, the air-conditioning units at home run almost everyday as we are more used to working in cooler environments (thanks to office life). Then, the air-con died on us. For some unknown reason, it tripped. To reduce the air-con usage, I bought a USB powered cooler from AliExpress on 11 May. It came on 29 May. Recently (re)popularised …