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Coffee beans are filled with oils that emerge from coffee grounds under high pressure. These oils form the crema - "the frothy stuff" on top of an espresso. In the last installment of Science Friday's series on coffee, food-science writer Harold McGee, author of On Food and Cooking, explains the chemistry of crema.

Truss became prime minister on Tuesday and immediately confronted the enormous task ahead of her amid increasing pressure to curb soaring prices, ease labor unrest and fix the health care system.

Most beef cattle receive antibiotics in their feed to prevent liver abscesses while eating a high-energy diet. There's growing pressure on feedlots to stop this — and some have. But it's costly.

Free speech scholars say ABC's decision to suspend Jimmy Kimmel's late-night show indefinitely represents "jawboning," when government officials pressure private companies to suppress speech.

Under pressure from the New York state comptroller — who oversees one of its largest shareholders — the doughnut chain has agreed to set a goal of using only 100 percent sustainable palm oil to make its doughnuts. Production of palm oil has caused serious deforestation in Indonesia.

Now that the accuracy of the article about sexual assaults at the school is being called into question, the conversation is changing and activists hope the attention will stay on sexual assault.

The U.S is planning its largest-ever release from its Strategic Petroleum Reserve. Here's what to know about the country's emergency oil stash.

On Thursday, more than 200 bodies of those killed in a crackdown on protesters by the Egyptian military were being prepared for burial at the El-Iman mosque in Cairo. Some mourners said the government was pressuring them to say the dead committed suicide or died of natural causes.

Deep breathing is not just relaxing; it's also been scientifically proven to affect the heart, the brain, digestion, the immune system. Research has shown that breathing exercises can have immediate effects by altering the pH of the blood, or changing blood pressure.

"The Americans are proposing the parties end the war by the beginning of this summer," Zelenskyy said, speaking to reporters on Friday.