The ubiquitous egg warmer

Because of the rich nutrition, eggs have quite a lot of fans in reality. They not only become tea eggs, fried eggs, boiled eggs as food sources and influence our diet, but also we can't separate them from expressions like "chatter", "idiot", "soul egg" (a passerby shouts: soul egg editor! This egg is not that egg!). Hardcore egg fans are just short of carrying a few eggs with them to cook and eat anytime.

Hey, you know what? A designer has actually designed a portable egg heater (Heater Egg Card). It folds down to the size of a card, small enough to be carried in a wallet. It allows egg fans to eat fresh and hot nutritious eggs anytime and anywhere. Sounds great, right? But the design concept of using a USB port for power supply seems impractical. According to Quintin's calculation, it may take you seven hours from the start of heating to get a fully cooked egg.