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 yacolp.co.

That's Y-A-K-U-L-T.co.j-J-P. When it comes to a guide for your gut, count on Yacolt.

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

Standing in line at passport control isn't the most relaxing experience.

The officer looks at your passport, at you, back at your passport, back at you, kind of nerve-wracking.

But put yourself in their shoes for a sec.

They're trying to figure out if your face is actually the same one as that little thumbnail image on the page.

It's not the easiest task.

People are often surprised at how poor they are.

David White is a cognitive psychologist at the University of New South Wales in Australia.

And he's even tested Australian passport agents at the task.

The performance was no better than a group of untrained university students.

In his latest study, White and his colleagues investigated how poor sleep, less than six

and a half hours a night, might affect facial recognition.

Turns out, bad sleep did indeed lead to more wrong answers on a face-matching task.

And study subjects suffering from insomnia, meaning poor sleep plus other symptoms like

anxiety scored badly too compared to well-rested subjects.

But here's the twist.

When they made errors, people in this insomnia group, they actually had higher levels of confidence.

...