Imagine what hankerchiefs would look like...

Here's something for you to ponder. Imagine if cold and flu viruses were visible and coloured fluorescent green. Think how different we'd be treating people who were sick.

Like every time a person with a cold or the flu sneezed or coughed, you could see the stuff in the air, or being wiped from their nose. Everything they touched would have glowing green stuff on it. When a sick person showed up for work, you'd be able to tell they were sick from a long way off.

I could see sick people being told to stay home more often. And if they didn't, I could see them suffering a fair amount of discrimination based on the fact we could see their illness.