Trying to identify what made the Universe transparent
Timeline of the early Universe, showing the Dark Ages and the First Light, when reionization allows starlight to travel long distances.ESOEarly in the Universe's history, something ionized most of the diffuse hydrogen gas that’s spread between galaxies. But until now, the source responsible for this ionization has been largely mysterious—a conundrum...
I regard the brain as a computer which will stop working when its component fail. There is no heaven or afterlife for broken-down computers. That is a fairy story for people afraid of the dark