Eating a buttered toast will provide you with 315 kJ (75 kcal) of energy which is just enough to keep you cycling for 10 minutes ot jogging for 6 minutes. Powered with the same amount of energy, a 60 W light bulb will run for 1.5 hours. Believe it or not, but the sound energy of as many as 200 pianos will be needed if you want to light this very same light bulb.
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