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.co.jp. When it comes to a guide for your gut, count on Yacolt.

This is Scientific Americans' 60-second science. I'm Steve Merski.

A year ago, I reported on a study about an increase in fatal traffic accidents on April 20th, 420,

a date considered somewhat of a holiday by marijuana aficionados.

That study was in the journal Jama Internal Medicine, and it used data from the U.S. National

Highway Traffic Safety Administration. The researchers looked at fatal accidents on 4.20, between 4.20 p.m.

and 1159 p.m. from 1992 to 2016. And they compared that dates data with the day one week before and one week after.

They found a 12% increase in the relative risk of a fatal traffic accident after 4.20 p.m.

on 420 p.m. being the time that a lot of pot smokers like to light up on 420.

The paper caught the attention of McGill University epidemiologists Sam Harper and Adam

Palliou.

I should say at first, I thought the paper was intriguing.

Sam Harper on the phone from Montreal.

I think the most fundamental difficulty with the JAMA paper was really the large magnitude of the effect size,

you know, given what we already know about impaired driving. So in order to increase the national

rate of fatal accidents by something like 12% would require, you know, either a really large

segment, you know, as much as 15% of the population, to be driving while high after 420 p.m.

On 420, or really, really incredibly high relative risks of driving after the kind of cannabis

...