Both tears and sweat are salty, but they render a different result. Tears will get you sympathy; sweat will get you change.
'Moonwalking with Einstein' refers to a memory device I used when I memorized a deck of playing cards at the U.S. Memory Championship. When I competed in 2006, I set a new U.S. record by memorizing a deck of cards in one minute and 40 seconds. That record has since fallen.