Walk on

Protests in the streets against police brutality, stoked by the racist psychopath in the White House... an ugly, primitive moment when it's easy to forget that our species has in fact evolved and advanced from humble origins. I return again and again to Carl Sagan's inspired and encouraging words.

"We humans have set foot on another world in a place called the Sea of Tranquility, an astonishing achievement for creatures such as we, whose earliest footsteps three and one-half million years old are preserved in the volcanic ash of east Africa. We have walked far."

That's why I'll be watching closely again when they try to launch that rocket in Florida tomorrow. We've still got a long way to go, and we need to go together.