Navan Fort, the legendary capital of Ulster. has long been considered a site of ritual gatherings.  Excavations have uncovered a huge 40-yard diameter building and a barbary ape cranium, likely from at least as far as Iberiam along with remnants of pigs, cattle and sheepfrom across Ireland, perhaps being reared as far afield as Galway, Donegal, Down, Tyrone and Antrim. 

That means Iron Age communities were very mobile at holiday time, their own version of driving for Christmas. 

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 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.

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.