What is transhumanism, or, what does it mean to be human?

"What does it mean to be human? Biology has a simple answer: If your DNA is consistent with Homo sapiens, you are human — but we all know that humanity is a lot more complex and nuanced than that. Other schools of science might classify humans by their sociological or psychological behavior, but again we know that actually being human is more than just the sum of our thoughts and actions. You can also look at being human as a sliding scale. If you were to build a human from scratch, from the bottom up, at some point you cross the threshold into humanity — if you believe in evolution, at some point we ceased being a great ape and became human. Likewise, if you slowly remove parts from a human, you cross the threshold into inhumanity. Again, though, we run into the same problem: How do we codify, classify, and ratify what actually makes us human?"

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Full article:

http://www.extremetech.com/extreme/152240-what-is-transhumanism-or-what-does-it-mean-to-be-human