Sometimes it’s quite handy to have a good explanation, why distance equals time, and why this is important in computing. RDML Hopper finds a 30 cm cable quite useful in order to explain that. Thanks to Youtube i find it really useful that there is now the opportunity to let her tell this for herself. Perhaps it would be really quite useful to have some nanoseconds on your desk. Or threehundred metres Cat7 to demonstrate a microsecond.