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Use "femtoseconds" in a sentence
"If you shoot a particle at them and knock a hole in them, they repair themselves; they go zip and they repair the hole in femtoseconds, which is not -- is really quick."
"Each laser pulse packs a 220-millijoule punch into just 60 femtoseconds – an intensity “equivalent to the power of 1000 power plants,” says Kasparian."
"Those laser pulses are only 2.5 femtoseconds (that's billionths of a millionth of a second) long, and the light that flashes off of the neon was calculated at 80 attoseconds (that's billionths of a billionth of a second) long."