LearningBD

“It’s probably one of the first times that people who usually do more biostratigraphy — basically, deep-time research — on foraminifera are approaching such a question,” said Julie Meilland, a researcher at the Cerege, a research institute in France, who was not involved in the study. In addition to data on coiling direction from multiple

The largest hoard of Viking Age silver ever found in Finland — which contains almost 10 pounds (4.5 kilograms) of coins and jewelry — has been unearthed by a metal detectorist about 95 miles (150 kilometers) north of Helsinki. The hoard had been divided into two deposits and buried in birch-bark containers. Although the coins

Burning Up As the planet warms, our environment will be transformed, but so will our bodies. In this series, we investigate the health impacts of climate change, focusing on heat, air quality, food and infection risk. We also evaluate the promising solutions that could help us adapt to our warmer future. To the untrained eye,

By showing that each unavoidable configuration is “reducible” in this way, you’ve demonstrated that your minimal graph is four-colorable after all — your original assumption was wrong. The four-color theorem must be true. Unfortunately, 11 years after Kempe announced his proof, the mathematician Percy John Heawood discovered a subtle flaw in his color-swapping procedure: In