The diving pool for the Summer Olympics mysteriously turned green this week in Rio de Janeiro, then the pool next to it turned from blue to a lighter shade of green.

It's all very weird -- but Friday's explanation from a Rio 2016 spokesman is even weirder.

The diving pool was closed for practice Friday morning as officials struggled to fix the off-color water. The governing body of international swimming blamed the problem on a shortage of water-treating chemicals.

Swimmers have expressed frustration about conditions online and in the media, although Olympics officials insist the water is safe to swim in.

Now here's Rio 2016 spokesman Mario Andrada explaining the delay in fixing the water.

"Chemistry is not an exact science," he said. "Some things, as you can see, went longer than expected."

What? No. Wait. That's not ... chemistry ... is an ... exact ... ah, nevermind.

This could explain a lot, though.