Can you imagine what it was like for early humans?  Pitch black night, so dark you can’t see your hand in front of your face.  Frost or even ice and snow on the ground.  Predators lurking.  How did they possibly survive until the next day?

They must have slept fitfully.  Waking in the morning, they went out to seek food and water.  They solved problems that would stump contemporary humans.  In the end,   the unbroken chains they forged stretch across millenniums, from mitochondrial “Eve” to our mothers and sisters.