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Yes, even 1 can earn you GAS, but that's because 1 is the minimum! You earn stakes in increments of whole unites of NEO.

absolutely correct, 1 NEO will earn GAS, and of course you cannot divide up a NEO coin, a fairly unique attribute

Yeah i don't understand why they're indivisible. It's weird because you have to leave a fraction of one on the exchange when you transfer it to your wallet.