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.

J-P. That's Y-A-K-U-L-T.C-O.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 Taggata.

Exactly 1,000 years ago, in the year 1021, a Viking or two or three likely wandered around the very northern tip of Newfoundland, cutting down trees.

Clearing a particular spot or for gathering wood that might have been used as timber

for construction of some

type or perhaps for boat repair. They were very careful to obviously make sure their ships were

sea worthy. Michael D. is a geoscientist at the University of Groningen in the Netherlands. He says

it's not news that Vikings made it to North America around this time. Scientists and scholars

have surmised as much from archaeological remains in Newfoundland and by scrutinizing ancient

texts like the Icelandic sagas. One is not really sure how literal one can take the Icelandic

sagas. They contain a lot of not only inaccuracies, a lot of things that are obviously

fantastical, things like dead people speaking to them and so on. But now Dee and his colleagues

have been able to come up with a precise date, the year 1021, based on evidence these Norse

visitors left behind, specifically a stump, a log, and a branch.

Wood anatomists have determined that certain surfaces of that wood must have been cut by

metal blades. That's a Viking technology the local indigenous people are not known to have shared.

And Dee's team was able to use a cosmic occurrence, an extraordinary shower of high-energy particles from space

around the year 993, to date the felling of the trees. You see, that shower of cosmic rays

...