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Why Does Swiss Cheese Have Holes? Swiss Researchers Solve Mystery

The holes in Swiss cheese have stumped scientists for nearly a century. Now a team in Switzerland says they've found the holy grail.

Why Does Swiss Cheese Have Holes? Swiss Researchers Solve Mystery

BERN — Researchers in Switzerland say they've finally solved the mystery of why holes form in Swiss cheese. The clue is that Swiss cheese has had fewer holes in recent years because the cow's milk has gotten cleaner, reports the Swiss news agency ATS.

The researchers at Agroscope, a Swiss lab that studies food and agriculture production, dosed samples of Emmental with tiny particles of hay. Based on the amount of hay they inserted, the researchers found they could predict where and how many holes would form in the cheese.

“It’s now possible to get the cheese to open up almost exactly to your liking,” according to Thursday's press release of the findings.

Scientists have long tried to understand why holes formed in Swiss cheese. American researcher William Clark concluded in 1917 that the holes had something to do with carbon dioxide emitted by bacteria in the milk, but was ultimately unable to discern why the holes formed in some places and not others.

In recent years, pasteurization has moved to covered systems rather than open vats. Unwanted bacteria was reduced, but the holes in Swiss cheese also started to disappear.

“In addition to milk, enzymes and bacterial cultures, you need bits of hay,” the researchers conclude. “It’s a good example of how raw, unprocessed milk is still what essentially underlines the character of traditional Swiss cheeses.“

Lead photo: Gerard Lacz Images/VW Pics/ZUMA

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600 Miles To Moscow? Attack? Defend? What Ukraine’s Drone Strikes In Russia Really Mean

A Ukrainian soldier from the 63 brigade was seen flying a drone as part of military training simulating an attack

Anna Akage

As they’ve done for the past year, Ukrainians have spent the past three days studying maps and calculating distances. But there's a difference now: The maps are of Russia.

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The unprecedented drone attacks this week of airfields deep inside Russian territory open a new phase in the war that is both tactical and symbolic. Though still without official confirmation from Kyiv, nobody doubts that the Ukrainian military executed the three strikes between Monday and Tuesday hundreds of kilometers inside Russia, which killed three and injured at least nine, including the strategic military air base of Engels.

Alexander Kovalenko, a Ukrainian military and political observer of the Information Resistance group, writes on his Telegram channel: "International war observers have seen that regardless of what struck the Russian airfields, it bypassed the lauded Russian air defense system and accomplished the task," he said. "They see not only that the supposed No. 2 military in the world not only drags old T-62 tanks and D-1 howitzers into the combat zone in Ukraine, but that it essentially has no air defense."

French weekly magazine L’Express declared: “Ukraine wants to show that Russian territory is not safe.”

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