So we know that there were otters in Singapore sometime before the mid 20th century. But then Singapore started to change. It modernized, it started to industrialize, and all of a sudden the waterways got filthy.
So we know that there were otters in Singapore sometime before the mid 20th century. But then Singapore started to change. It modernized. It started to industrialize. And all of a sudden, the waterways got filthy.
Singapore enacted policies to clean up their waterways, and they were really, really successful. So all of a sudden, instead of having waterways that were filled with filth, we had waterways that were filled with fish. And from the otters' points of view, they were feeding troughs. So they came back.
78 percent of the air around us is nitrogen gas. That's a form that plants can't use, and so they've partnered with microbes on a process called nitrogen fixation. The microbes can breathe in that nitrogen gas and turn it into a form that plants can metabolize. It's a symbiosis, a partnership that's worked for millions of years, right up until the point that humans started breeding crops to be more productive.
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