articles

Populations of cheetahs in southern Africa have declined as farming and other human activities push deeper into the free-roaming cats’ range, a new study co-led by Duke University doctoral student Varsha Vijay finds.

A new study from the Energy Department’s National Renewable Energy Laboratory (NREL) establishes a novel catalytic method to produce renewable acrylonitrile using 3-hydroxypropionic acid (3-HP), which can be biologically produced from sugars. This hybrid biological-catalytic process offers an alternative to the conventional petrochemical production method and achieves unprecedented acrylonitrile yields.

Maps of the world’s most important wilderness areas are now freely available online following a University of Queensland and Wildlife Conservation Society-led study published today.

Zilin Jiang from Technion — Israel Institute of Technology and Alexandr Polyanskii from the Moscow Institute of Physics and Technology (MIPT) have proved László Fejes Tóth’s zone conjecture. Formulated in 1973, it says that if a unit sphere is completely covered by several zones, their combined width is at least π. The proof, published in the journal Geometric and Functional Analysis, is important for discrete geometry and enables new problems to be formulated.

NASA analyzed the rainfall generated by short-lived Tropical Cyclone 04B that formed and faded over a day in the Bay of Bengal.