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Cruises pack in extra value for families — most of the larger ships offer free kids' activities, lavish playrooms with computer games and toys galore, and family-friendly diversions like waterslides, miniature golf courses, and rock-climbing walls.

Physicists at JILA have created the first "frequency comb" in the extreme ultraviolet band of the spectrum, high-energy light less than 100 nanometers (nm) in wavelength. Laser-generated frequency combs are the most accurate method available for precisely measuring frequencies, or colors, of light