Electric/salty:

Chopsticks (2022) https://news.ycombinator.com/item?id=31083853 https://news.ycombinator.com/item?id=31119672

Spoon (2024) https://news.ycombinator.com/item?id=40552850 https://news.ycombinator.com/item?id=42659051

Interesting. Apparently by sending small doses electric currents into the food in the cup, sodium ions enhances the food and makes it salty. Impressive.