[MarkusWandel]

Handily enough the speed of light is about a foot per nanosecond, give or take. A nanosecond doesn't sound like much, unless you start to work out, for example, how many bits are inside your 40Gbps USB-C cable at the moment (they do travel at less than the speed of light).

[mark-r]

Grace Hopper used to hand out pieces of wire to represent nanoseconds. She used pepper to represent picoseconds.