I was getting off the Metro on the way to work, and, not for the first time, noticed the green light underneath the escalator.

So I fired up search on my phone, “Why is there a green light under an escalator?” and immediately found the answer: the lights are there to limn the edges of the steps, so as to reduce the possibility off placing one’s feet between stairs, which might cause a fall.

This is a technical development that was unimaginable to the most technologically forward looking science fiction author just 30 years ago.

Of course those same authors had me commuting to work with a jet-pack, which has not yet happened.

I still want that jet-pack, damn it.

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