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We often think of first responders mainly as police, fire and emergency-medical professionals. In Las Vegas on Monday, NPR's Eric Westervelt found a small volunteer army of mental-health professionals, trauma counselors, psychiatrists and social workers who quickly fanned out to help some of the thousands who had witnessed the massacre up close.

The vision of Las Vegas as a world-renowned hub for cancer treatment took center stage last week at a gathering of experts on the No. 2 killer of Americans.

If leading the country’s fifth-largest school district isn’t daunting enough, try doing so in the midst of a massive reorganization, a budget deficit of at least $60 million and a continual firestorm of pushback from unions and trustees.

Scientists may have underestimated the effect of cosmic rays on humans as they leave Earth’s atmosphere and are exposed to the deadly radiation.

Imagine Fremont Street free of profane language. Or a downtown Las Vegas landscape where cattle, horses, burros, sheep and goats run free.

A group of college professors is rallying in support of consumers’ right to sue. Some 423 law school, university and college professors are sending a letter to two senators, encouraging them to support a rule the Consumer Financial Protection Bureau has passed.

NASA is dead-set on sending astronauts to Mars within the next 15 to 20 years. China has said it hopes to send people there between 2020 and 2030, and even Russia is floating plans to put boots on the red planet.

The first ad in MGM Resorts International’s massive new “Welcome to the Show” campaign featured cinema-like video of the company’s properties and attractions interspersed with written text such as “Mankind was not born to be bored” and “We invented MGM to entertain the human race.”

Las Vegas-based data-center company Switch Ltd. is angling to go public. The company filed documents with the Securities and Exchange Commission on Sept. 8 for an initial public offering under the name Switch Inc.