Light propagation usually goes both ways; it is reciprocal in that the trajectory of light traveling one direction is identical in the opposite direction.

Isolators and circulators, which make light propagate only in one direction, are vital building blocks in many modern laser and communication systems, but are almost exclusively based on the magneto-optic effect, making devices bulky and difficult for integration. A magnetic-free route would be a great breakthrough for many optical applications. 

The idea of hanging up decorations in the middle of winter is older than Christmas itself. Decorations are mentioned in ancient descriptions of the Roman feast of Saturnalia, which is thought to have originated in the 5th century BC.

Some 900 years later, a Christian bishop in Turkey wrote disapprovingly about members of his congregation who were drinking, feasting, dancing and “crowning their doors” with decorations in a pagan fashion at this time of year.

The CDC has updated its fatality and illness list due to illicit marijuana vaping. Now there have been 54 deaths and 2,506 hospitalizations. The culprit is Vitamin E acetate, needed to make marijuana tetrahydrocannabinol (THC)products into a vapor because, unlike nicotine, it does not dilute readily.

You may be aware that film runs at 25 frames per second because humans will then not see it as individual images. These 'blinks per second' are measured in Hertz and some humans can see up to 60 Hz.

You may not sleep well if you have a light blinking all night. And a new study shows that in bird care, light control is even more important than realized.

A new study has found that birds of prey have much greater visual acuity but a peregrine falcon is over twice as adept as humans - 129 Hz, which would be like being able to see the details of a race car driver's face as they zoom by you at 200 miles per hour.

Merck has received approval for Ervebo, the first F vaccine for the prevention of Ebola virus disease (EVD), caused by Zaire ebolavirus in individuals 18 years of age and older.

Cases of EVD are very rare in the U.S., only acquired by individuals in other countries who then traveled to the U.S., or health care workers who became ill after treating patients with EVD.

“While the risk of Ebola virus disease in the U.S. remains low, the U.S. government remains deeply committed to fighting devastating Ebola outbreaks in Africa, including the current outbreak in the Democratic Republic of the Congo,” said Anna Abram, FDA Deputy Commissioner for Policy, Legislation, and International Affairs.

Two years ago we were helping my mother-in-law get settled into her new place and, with the manual labor done and my usefulness diminished, she and her daughters talked details and I sat in a chair. A Hallmark movie was on. I had never seen it before but I was convinced I had.

After about 10 minutes, when a seemingly avoidable misunderstanding occurred onscreen, I began taking notes on my phone and talking about the action. My family asked what I was doing and I declared that this was brilliant storytelling. This formula could work with anything, it was that rock solid.

Scientists have discovered remnants of the world's oldest fossil forest in of all places, a sandstone quarry in Cairo, New York.

It is believed the extensive network of trees is around 386 million years old and spread into Pennsylvania and beyond.

The Trump administration has issued a notice of proposed rulemaking (NPRM) that would allow for the importation of certain prescription drugs from Canada. In addition, the Administration is announcing the availability of a new draft guidance for industry that describes procedures drug manufacturers can follow to facilitate importation of prescription drugs, including biological products, that are FDA-approved, manufactured abroad, authorized for sale in any foreign country, and originally intended for sale in that foreign country.

Board games, where you play on an actual board, were once common in every household. Games have a long history, thousands of years, but board games took off in diversity in the 20th century, thanks to "Monopoly" and then others.

It's impossible to predict the future so they may never again reach the peak popularity they once had, or they may stage a resurgence as young people want to take a break from an increasingly digital society. They may even become bigger than ever. I never once played Texas Hold 'em as a young guy in Pennsylvania but in the 2000s it took off nationwide and has now become the most popular form of poker.(1) My kids have never played draw or stud but I showed them how to play Hold'em.

Mitochondria, the energy factories in most of our cells that convert the fat, carbohydrates, and protein we eat into a common energy currency used by our bodies, also set off molecular alarms when cells are exposed to stress or chemicals that can damage DNA, such as chemotherapy, according to a new study in Nature Metabolism.

This basic research could one day lead to applied science, like cancer treatments that prevent tumors from becoming resistant to chemotherapy.