Nothing, but what is the significance of there being nothing between 0.999... and 1? If there is nothing between 0.999... and 1, then you would not the logical conclusion be that there is nothing between 0.888... and 0.999..., therefore 0.888... = 0.999..., and since 0.999...... = 1 then 0.888 = 1 as well?
There's plenty of numbers (infinite) in between
.9
.89
.889
.891
What would you say 1 -
"Protozoa are small, and bacteria are small, but viruses are smaller than the both put together."