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That depends on the reference point.

From the human PoV We notice chimps ape us.

If Chimps were to study humans, they may also notice humans ape them and come to the conclusion that humans synchronize steps like chimpanzees do.

Us being human, then we notice they synchronize like we do.

Humans have been evolving for exactly as long as chimpanzees. To the second.

I love that statement and I'm stealing it.

The thought occurred that time dilation would result in the descendants of ISS crew members (and of their gut flora, for that matter) falling behind, but it would take a looong time in orbit to add up to a second.

Few have reproduced after being there. Have any?

I don't know, but their gut flora certainly have.

I guess failing to reproduce after would count, too.

Though chimpanzees are apes, this was my first thought as well.

what difference does it make?

At this point? -HRC