If one person passes on flu to 1.3new people it takes a while to spread, but with Corona virus it spreads to 2 people on average.
I decided to multiply 1 x2and see what happened. I realised after I got to eight billion that I was wrong, you would have to add 1+2+4+8+16+32+64 to get the true figure. So instead of getting to over 8 billion in 34 days it would take a lot less time.
So I don’t want to worry you, but please wash your hands.