Understanding the Block Chain

Ref: A block chain is a transaction database shared by all nodes participating in a system based on the Bitcoin protocol. A full copy of a currency’s block chain contains every transaction ever executed in the currency. With this information, one can find out how much value belonged to each address at any point in history.


Are Hummingbirds the Only Birds that Can Fly Backwards?

Nope. See, for example: This falsehood was started by the Trivial Pursuit game I believe, and seems to have entered popular culture (e.g. “Assembling the Wreckage” by Kevin Fisher p. 109). For me, this is another example of the importance of critical thinking and always challenging the dominant paradigm.