According to the Law of Conservation of Mass, matter can neither be created nor destroyed. This means that all atoms are recycled over time. Which in turn means that our own atoms are ancient as well. One’s skin could have carbon in it from a meteorite or from a trilobite thousands of years old, and your blood could contain hydrogen from earth’s original atmosphere.
Sex isn’t chromosomes: the story of a century of misconceptions about X & Y
Sex isn’t chromosomes: the story of a century of misconceptions about X & Y
The science side of deconstructing the gender binary.
This is a really great article. Without using the words “social construction” it explains how everything we take for granted about “biological sex” and genetics is socially constructed, and thus subject to bias in assumptions, theory and results and is in dire need of re-evaluation.
We on Earth have just awakened to the great oceans of space and time from which we have emerged. We are the legacy of 15 billion years of cosmic evolution. We have a choice: We can enhance life and come to know the universe that made us, or we can squander our 15 billion year heritage in meaningless self-destruction. What happens in the first second of the next cosmic year depends on what we do, here and now, with our intelligence and our knowledge of the cosmos.
Carl Sagan
(via nasahistory)
(via nasahistory)