Related Clues:

• More than cool
• Sleep initials
• "The One I Love" group
• 90's kids' catchword
• Nobelist of 1903
• 'Cool'
• Unit of 100 ergs per gram
• 'Out of sight!'
• Good, at the beach
• Married name of Maria Sklodowska
• "Far out!" to a physicist?
• 'Totally tubular!'
• 3.7 x 10 to the 10th power disintegrations per second, to a physicist
• Sleep phenom
• Sleep phenom, for short