The number in the title, interpreted in units per square centimeters per second, is a flux rate, and it is a new world record set by the Tevatron collider last night on the number of protons and antiprotons forced to cross each other within a tiny interaction region in the core of the CDF and DZERO experiments.

In a paper appearing today in Science, Los Alamos researchers report that a newly discovered "loading-unloading" effect allows nanocrystalline materials to heal themselves after suffering radiation-induced damage. The discovery may eventually lead to much safer nuclear power plants.

Nanocrystalline materials are those created from nanosized particles, in this case copper particles. A single nanosized particle—called a grain—is the size of a virus or even smaller. Nanocrystalline materials consist of a mixture of grains and the interface between those grains, called grain boundaries.

Scientists have identified a hip bone found at Dinosaur Cove in Victoria, Australia that belonged to an ancestor of Tyrannosaurus rex. The discovery is the first evidence that tyrannosaur dinosaurs existed on southern continents.

The find, published in Science, sheds new light on the evolutionary history of this group of dinosaurs. It also raises the crucial question of why it was only in the north that tyrannosaurs evolved into the giant predators like T. rex.

The 30cm-long pubis bone from Dinosaur Cove looks like a rod with two expanded ends, one of which is flattened and connects to the hip and the other looks like a 'boot'.

As a result of the economic growth across much of Asia pollution from the region is being wafted up to the stratosphere during monsoon season, according to a new study in Science.

The new finding provides additional evidence of the global nature of air pollution and its effects far above Earth's surface.

Using satellite observations and computer models, the research team determined that vigorous summertime circulation patterns associated with the Asian monsoon rapidly transport air upward from the Earth's surface. Those vertical movements provide a pathway for black carbon, sulfur dioxide, nitrogen oxides, and other pollutants to ascend into the stratosphere, about 20-25 miles above the Earth's surface.

Satellite measurements of the Atlantic Meridional Overturning Circulation (AMOC), part of the global ocean conveyor belt that helps regulate climate around the North Atlantic, show no significant slowing over the past 15 years and suggest that the circulation may have even sped up slightly in the recent past.

The findings are the result of a new monitoring technique, developed by oceanographer Josh Willis of NASA's Jet Propulsion Laboratory in Pasadena, Calif., using measurements from ocean-observing satellites and profiling floats.

Tumors mimic key features of lymph nodes in order to create a tolerant microenviroment and escape attack from the immune system, say researchers from Ecole Polytechnique Fédérale de Lausanne in Switzerland.

The discovery, published in Science underscores the role of the lymphatic system in cancer and may open up new possibilities for cancer treatment.

Although the internet has given anybody with a computer access to a seemingly limitless amount of information, it has also had a profound effect on clinical medicine--and not necessarily a good one.

Doctor's writing in the New England Journal of Medicine say that patients are often exposed to incorrect or poorly interpreted information on the internet that is fundamentally changing the "the core relationship between doctor and patient."

While applauding the ability of patients to receive test results and communicate with their clinicians electronically – and to search for disease symptoms at numerous web sites – the authors suggest it is a journey no patient should undertake alone.

An international team of astronomers has confirmed that the expansion of the universe is accelerating after looking at new data from the largest-ever survey conducted by the Hubble Space Telescope. The results of the research will appear in Astronomy and Astrophysics.

Researchers studied more than 446,000 galaxies to map the matter distribution and the expansion history of the universe. They were able to observe precisely how dark matter evolved in the universe and to reconstruct a three-dimensional map of the dark matter and use this to test Albert Einstein's theory of general relativity.

By changing the material medium through which x-rays pass, physicists at Lawrence Berkeley National Laboratory have used laser light to control x-ray beams.

As a new generation of powerful light sources comes online, intense x-ray beams may be able to control matter directly and allow one beam of x-rays to control another, the new Nature Physics study suggests.

Using the Lawrence Berkeley National Laboratory's Advanced Light Source femtosecond spectroscopy beamline 6.0.2, researchers sent ultrashort pulses of laser light and higher-frequency x-rays together through a gas cell filled with pressurized neon. Excited by the laser pulses, the gas, which normally absorbs x-rays, became transparent to the x-ray pulses during their quick passage.

Paleontologists have discovered a new bird fossil in northeast China that provides more evidence for a specialized group of small birds that diversified during the Early Cretaceous between about 130 and 120 million years ago.

The discovery also suggests that scientists have only tapped a small proportion of the birds and dinosaurs that were living at that time.

The new bird, named “Longicrusavis houi,” belongs to a group of birds known as ornithuromorphs (Ornithuromorpha), which are rare in rocks of this age. Ornithuromorphs are more closely related to modern birds than are most of the other birds from the Jehol Biota.