How to Escape From a Black Hole

The size of the universe is determined by the laws of nature. Where these laws end, at the boundary, the universe ends, space itself ends - nothing can exist beyond the border. All the matter and energy that strike the boundary are absorbed. At the same time new massless matter is created to replace the absorbed matter.

New data from an international, multicenter Phase III clinical trial has found that the experimental targeted therapy everolimus (RAD001) significantly delays cancer progression in patients with metastatic kidney cancer whose disease had worsened on other treatments.

Everyone who has an e-mail account has probably received a forwarded chain letter promising good luck if the message is forwarded on to others--or terrible misfortune if it isn't. The sheer volume of forwarded messages such as chain letters, online petitions, jokes and other materials leads to a simple question--how do these messages reach so many people so quickly?

One of the most famous figures in psychology is the following:

Changing the sugars attached to a hormone produced in the pituitary gland increased fertility levels in mice nearly 50 percent, a research group at Washington University School of Medicine in St. Louis has found. The change appears to alter a reproductive "thermostat," unveiling part of an intricate regulatory system that may one day be used to enhance human fertility.

New observations from NASA's Mars Reconnaissance Orbiter indicate that the crust and upper mantle of Mars are stiffer and colder than previously thought. The findings suggest any liquid water that might exist below the planet's surface and any possible organisms living in that water, would be located deeper than scientists had suspected.

Studies of how cancer cells spread have led to a surprising discovery about the creation of cells with adult stem-cell characteristics, offering potentially major implications for regenerative medicine and for cancer treatment.

Researchers from the University of Pennsylvania School of Medicine have shown, in unprecedented detail, how a small molecule is able to selectively take apart abnormally folded protein fibers connected to Alzheimer's disease and prion diseases. The findings appear online this week in the Proceedings of the National Academy of Sciences. Finding a way to dismantle misfolded proteins has implications for new treatments for a host of neurodegenerative diseases.

A new study reveals the genetic identity of human immunodeficiency virus (HIV), the version responsible for sexual transmission, in unprecedented detail. Scientists found that among billions of HIV variants only a few lead to sexual transmission.