Beef cattle ranchers are getting wise to the science of genetics.

They have always known that making the best steak starts long before consumers pick out the right cut, such as where an animal grazes or what it eats. The key is in the genetic makeup — or DNA — of the herd. And over the past year, those genetics have taken a historic leap thanks to new, predictive DNA technology.

This is playing out in rising auction prices for the best bulls as identified by genetic profiles or simply for their elite pedigree.

President Trump says he will announce Tuesday whether he is going to keep the U.S. in the Iran nuclear deal. This comes after Trump has allowed the deal to stay in place through the first 15 months of his presidency while frequently criticizing it and threatening to pull the U.S. out of it.

As America heads toward the 2018 midterms, there is an 800-pound gorilla in the voting booth.

Despite improvements since Russia's attack on the 2016 presidential race, the U.S. elections infrastructure is vulnerable — and will remain so in November.

Cybersecurity expert Bruce Schneier laid out the problem to an overflowing room full of election directors and secretaries of state — people charged with running and securing elections — at a conference at Harvard University this spring.

Well, it's official. Beginning today, all restaurant chains in the U.S. with 20 or more locations must post calories on menus or menu boards.

When Congress passed the Affordable Care Act, back in 2010, the federal calorie posting mandate was born.

Many chains, including McDonald's, Panera and Starbucks, began posting calories several years back. But the proposed regulations hit several snags as industry groups lobbied for changes. Now, there's no escaping them.

Lyme disease was once unheard of in western Pennsylvania, where Barbara Thorne, now an entomologist at the University of Maryland, spent time as a kid.

Thorne knew that if black-legged ticks are infected with bacteria called Borrelia burgdorferi, they can transmit Lyme to people and, that if untreated, symptoms can range from fever, fatigue and a rash, to serious damage to the joints, heart and nervous system.

This week in our roundup, we travel from Arizona to the United Kingdom to the Philippines to bring you the education news.

Teachers in Arizona head back to class