Science history: Carbon-14 is discovered, opening a window into past civilizations — Feb. 27, 1940

Martin Kamen and Samuel Ruben's discovery of the radioactive isotope carbon-14 in 1940 helped usher in a new era of dating ...
Science Daily

MIT study finds Earth’s first animals were likely ancient sea sponges

Scientists at MIT have found compelling chemical evidence that Earth’s earliest animals were likely ancient sea sponges.