May 2011 - HDYK? - Day 5/Level 3

Congrats on making it to the last page of today's challenge. Don't forget to leave in the comments below, both the correct answer to the following question, AND the item from the neatoshop that you want if you're selected at random. If you don't leave the item you want, you will be disqualified.

Question: The voltaic pile was the first version of what electrochemical cell, which come in the modern types of "9-volt" and "AAA"?





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