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.
1 Romaine or Cos â This is named for its darker green leaves and elongated heads. 2  Romaine lettuce was first grown in the Papal gardens in Rome, giving this variety its present day name of Romaine.3  The Greeks called this variety Cos from the Greek Island of Kos where it was grown. Romaine or Cos â This is named for its darker green leaves and elongated heads. 2  Romaine lettuce was first grown in the Papal gardens in Rome, giving this variety its present day name of Romaine.