Astronomer Stephen Edberg captured this sequence of the full moon as it enters Earth's shadow and then is completely covered by it on August 28, 2007. The moon's passes through nearly the same portion of Earth's shadow during the total lunar eclipse on April 14-15, 2014 but the coloring may be different. A lunar eclipse occurs when the Moon passes directly behind the Earth into its umbra (shadow). This can occur only when the Sun, Earth, and Moon are aligned exactly, or very closely so, with the Earth in the middle. Hence, a lunar eclipse can only occur the night of a full moon. The type and length of an eclipse depend upon the Moon's location relative to its orbital nodes. When the Moon travels completely into the Earth's umbra, one observes a total lunar eclipse. View more images of lunar eclipses
100 years ago one of the deadliest natural disasters hit humanity, killing approximately 4 percent of the earth's population. Even people in remote Pacific Islands and the Arctic met their demise due to this virus. This shocking number of deaths was caused by the flu, although these days most healthy people take the flu lightly.
That particular strain, the H1N1 influenza virus, commonly known as the Spanish Flu, claimed many young as well as many previously healthy adults. Additionally, since it arrived on the heels of the Great War, many people were malnourished, living in overcrowded medical camps with little access to good hygiene. Royalty Free and Rights Managed Stock Images of the Flu
Government censorship may have played a role in the pandemic. To appear strong, many governments didn't reveal how devastating the flu was, giving no warning to the public to protect themselves. In Spain this information was not censored, giving the world the false impression that the Spani…
Alzheimer’s has been a mysterious disease ever since it was discovered. Considered to be a condition that fits into the dementia category, Alzheimer’s disease is characterized by physical changes in the brain that deteriorate brain function, cognitive ability, and memory in a certain pattern. People who are at least 65 years old are most often affected, however, there are also early-onset cases.
The progression of Alzheimer’s happens over decades and since the brain is such a complicated organ, it has been difficult for scientists to study.
The brain of the patient that had the first named case of Alzheimer’s disease was found to have amyloid (protein) plaques and tao tangles (tangles of fibers) within it. These abnormalities have long been considered by medical professionals to be one of the main causes of the disease, however recent studies suggest that the true cause could be another condition that happens initially, and this abnormal tissue growth may be a secondary symptom.Stock…
Dive into chemistry with 3d molecular models! See how the basic building blocks of matter form to create everything in the known universe.
Need a refresher on chemistry?
An element is a single atom characterized by the number of protons in its nucleus. Atoms bind together to form molecules, which can either be a series of the same element or different elements, making it a compound.
A molecule can be a simple pairing of one element, such as the oxygen in the air (O2) or a complex chemical compound, such as ethanol (CH5OH) or baking soda (NaHCO3), containing many different elements.Stock Image Gallery of Molecular Models and Video
3d illustrators represent molecules in a variety of ways. There’s the classic ball and stick model, ribbon models, and the intricate hydrophobicity surface model.
CPK coloring is the most common color system for models (white for hydrogen, black for carbon, red for oxygen, etc.), but artists use a variety of different color pallets to bring uniqueness to th…