I am taking a course in mathematics that covers countability. The trick with the uncountability of the real line is that no matter how many times you divide up an interval, there would still be a real number inside of that interval so that even the smallest interval contains "more than infinite" amount of numbers.
However it seems that our "reality" as we experience it on Earth behaves nothing like the real line. For example, the total number of blades of grass in a soccer field is countable. Similarly, the cardinality of all the sand on the beach is also countable. Ants, leaves, anything macroscopic. Not just countable but finite.
But what about things that are smaller. For example, numbers of thermally excited electrons over a surface, or number of photons hitting our retina? What are some things that can be truly considered uncountable within our universe?
(Obviously excluding the multiverse hypothesis)