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.
Green Leaf Lettuce (1 serving) 1  Calories: 2, Fat: 0g, Carbs: 0g, Protein: 0g. 2  Calories: 0, Fat: 0g, Carbs: 0g, Protein: 0g. 3  Calories: 10, Fat: 0g, Carbs: 2g, Protein: 1g. 4  Calories: 19, Fat: 0g, Carbs: 2g, Protein: 1g. 5  Calories: 10, Fat: 0g, Carbs: 2g, Protein: 1g. 6  Calories: 4, Fat: 0g, Carbs: 1g, Protein: 0g.