Curium is a hard, brittle, radioactive silvery metal. It does not occur in nature and must be made in a nuclear reactor by neutron capture reactions from plutonium and americium isotopes. It tarnishes slowly in dry air at room temperature.
Romaine lettuce is a rich source of fiber and has very few calories, only 8 in a one-cup serving. In terms of vitamins, a cup of Romaine lettuce delivers more than 50% of your daily requirement for vitamin A, as well as significant levels of vitamin K and vitamin C.
Of the macronutrients, carbohydrates contribute the greatest number of calories in lettuce. Each 3-ounce serving of lettuce contains roughly 1.1 to 2 grams of carbohydrates, with each gram offering 4 calories. This equates to 4.4 to about 8 calories from carbohydrates in your bed of lettuce.