There are certain truths we hold to be self-evident about San Franciscans: We love learning new things, and we love mild, non-lethal electrocution. Thankfully, deep within the moodily-lit Steinhart Aquarium at the California Academy of Sciences, through the Amazon Flooded Forest and nearly hidden in the shadows of the Northern California Coast exhibit, is a big ol' electric eel that satisfies both cravings.
Since allowing patrons to reach into the tank would be a tad unhygienic, the Aquarium provides the next best thing: an electric eel simulator on the wall, complete with the irresistible words: "How does an electric eel catch dinner? Touch the eel for a shock."
Granted, it's a picture of an eel with two electric small plates attached -- and it most likely is not the prey-stunning 650 volts the sign says eels are capable of......but when you touch them with your thumb and forefinger, bzzzzap! You suddenly become aware of the muscles in your finger as a non-damaging electrical charge surges through them for an instant, and you'll very much understand how electric eels catch their dinner. Learning is fun!
When you're done with that, you may want to check out the the anaconda arm-squeeze simulator nearby. Y'know, if you're into that sort of thing.
We're not here to judge. This is San Francisco, after all.