Carolyn tested out how much effort it took to power up various types of lightbulbs while pedaling a bike at the science museum today.
I feel like we just finally finished switching all of our incandescent bulbs to CFLs, and now it's time to switch all those out to LEDs. By the time the LED bulbs die, how many more types of bulbs will have been invented and, in turn, phased out? :)
