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 American's 60-second science. I'm Christopher in Taliatta.

Every day, 5 million commuters ride the Hong Kong metro,

human commuters, that is,

because there are countless more microbes riding the trains too.

Yes, it seems that they are also riding the metro to move around without paying a ticket.

Yanni Panayoto is a systems biologist at the University of Hong Kong and the Hans-Kinol Institute

in Germany. He and his team tracked the ebb and flow of microbes in the Hong Kong metro

by swabbing six volunteer commuters' palms as they commuted both day and night through the

city's eight urban lines. DNA sequencing revealed a lot of harmless skin and soil

microbes, but also other germs that harbored antibiotic resistance genes. And while some trains had

unique microbial fingerprints in the morning, like an above-ground line running near a polluted river

that had more aquatic and sewage-related species, by the evening commute, the microbial footprint

of all lines was nearly the same. In other words, microbes wind up commuting too. The studies in the journal

cell reports. The authors also hypothesized that cross-contamination can occur between regions with

different antibiotics use or guidelines. For example, tetracycline is common on mainland China's pig farms,

and it was the line crossing into Hong Kong from mainland China

that shuttled the most tetracycline resistance genes into the city each morning,

...