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The bird flu virus that is spreading through American dairy cows can probably be traced back to a single spillover event. Late last year, scientists believe, the virus jumped from wild birds into cattle in the Texas panhandle. By this spring, the virus, known as H5N1, had travelled hundreds of miles or more, appearing on farms in Idaho, North Carolina and Michigan.
Instagram series "Reel Life Research Rams" features top Colorado State University student researchers and their important role in discovery.
Cookstown photographer Martin McKenna can pinpoint the moment his passion for sky-watching was ignited.
Temperatures fell to -7C in Katesbridge in County Down on Saturday night.
Strabane has recorded level 10 - the highest number on the scale and Newtownstewart is at level eight.