My picks from ScienceDaily

Sleep Problems -- Real And Perceived -- Get In The Way Of Alcoholism Recovery:

The first few months of recovery from an alcohol problem are hard enough. But they're often made worse by serious sleep problems, caused by the loss of alcohol's sedative effects, and the long-term sleep-disrupting impact that alcohol dependence can have on the brain.

Solving Darwin's Dilemma: Oxygen May Be The Clue To First Appearance Of Large Animals :

The sudden appearance of large animal fossils more than 500 million years ago -- a problem that perplexed even Charles Darwin and is commonly known as "Darwin's Dilemma" -- may be due to a huge increase of oxygen in the world's oceans, says Queen's paleontologist Guy Narbonne, an expert in the early evolution of animals and their ecosystems.

Geobiologists Solve 'Catch-22 Problem' Concerning The Rise Of Atmospheric Oxygen:

Two and a half billion years ago, when our evolutionary ancestors were little more than a twinkle in a bacterium's plasma membrane, the process known as photosynthesis suddenly gained the ability to release molecular oxygen into Earth's atmosphere, causing one of the largest environmental changes in the history of our planet. The organisms assumed responsible were the cyanobacteria, which are known to have evolved the ability to turn water, carbon dioxide, and sunlight into oxygen and sugar, and are still around today as the blue-green algae and the chloroplasts in all green plants.

Riddle Of The Great Pyramids Of Giza: Professor Finds Some Building Blocks Were Concrete:

In partially solving a mystery that has baffled archeologists for centuries, a Drexel University professor has determined that the Great Pyramids of Giza were constructed with a combination of not only carved stones but the first blocks of limestone-based concrete cast by any civilization.

Brain Wave Changes In Adolescence Signal Reorganization Of The Brain:

Brain wave changes in adolescence are related to age, not sexual maturation, and may be associated with one of the brain's major reorganization projects: synaptic pruning, a new study finds.