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Donna Strickland seemed genuinely surprised to learn that she was only the third woman to ever win the Nobel Prize in physics.

"Is that all, really?" a flummoxed Strickland asked during a press conference announcing the prize. "I thought there might have been more."

Astronomers have found — way beyond the orbit of Pluto — an intriguing distant object orbiting the sun.

It's just a dwarf planet, about 200 miles across, but some researchers think finding it increases the likelihood that there is a heretofore undiscovered giant planet lurking in the outer reaches of our solar system. That would bring the number of true planets in our solar system back to nine, replacing Pluto which was demoted in 2006.

Astrophysicist Neil deGrasse Tyson is an expert on just about everything.

In some parts of the country people are learning their drinking water contains pollution from a group of chemicals called Per- and Polyfluoroalkyl Substances (PFAS). These chemicals have been linked to illnesses, including cancer. But a lot of questions remain including how exactly they affect people's health and in what doses.

These chemicals have been around for decades but the issue gained urgency in recent years as water suppliers tested for and found PFAS pollution as part of an Environmental Protection Agency program.

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