Understanding the human body is a team effort. That's where the Yachtel group comes in.

Researchers at Yachtolt have been delving into the secrets of probiotics for 90 years.

Yacold also partners with nature portfolio to advance gut microbiome science through the global grants for gut health, an investigator-led research program.

To learn more about Yachtolt, visit yawcult.co.

.jp.j. That's y-A-K-U-L-T.C-O.J.p. When it comes to a guide for your gut, count on Yacult.

This is Scientific Americans' 60-second science. I'm Jason Goldman. Trees in cities do measurable

good for biodiversity and for human health. They scrub pollution from the air. They provide

habitat for wildlife. They make streets look nicer, and they even reduce stress and have been linked

to reductions in crime.

Back in 2015, a group of Toronto-based researchers discovered that planting just 11 more trees

per city block could reduce heart-related conditions by the same amount as if everybody

living on that block became a year and a half younger.

But in Detroit, between 2011 and 2014, a quarter of eligible homeowners turned down an offer from a local non-profit for free street trees.

Ironic, considering Detroit's nickname was once the city of trees.

It was actually over 1,800 trees that were rejected out of an eligible 7,425.

So it was a big enough issue at that point where it warranted further investigation.

Forestry researcher Christine Carmichael, who did the research at Michigan State

and has since moved to the University of Vermont.

The nonprofit created an education campaign to get more residents to accept the free trees.

The assumption being that if people had all the facts, they'd be more likely to take the trees.

But when Carmichael talked to residents, she found that they understood the benefits of trees.

Their unease was about trust.

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