Biological Sciences

New Brain Region Knows Why You Are Feeling Down

Green basal ganglia neurons release red glutamate and blue GABA in the brain resulting in the sporadic mix of both neurotransmitters, shown in white.  Credit: UC San Diego’s School of Medicine

The University of California San Diego’s School of Medicine has recently identified the part of the brain that controls disappointment among mammals. Researchers have been granted a new insight into why and how people feel disappointed. Seeing the glass half empty may no longer be a matter of perspective, but...


Hearing Affected by Sounds You Cannot Hear

Low frequency waves can cause just as much damage to human hearing as can loud, audible waves.

Researchers led by neurobiologist Markus Drexl at the Ludwig Maximilian University have found evidence that inaudible sounds could cause hearing loss. While many people know that exposure to loud, audible sounds for long periods of time can cause hearing damage, previously, research had yet to show evidence that inaudible sounds...


Vitamin D Analog Used to Weaken Pancreatic Cancer

Non-cancerous stellate cells (depicted in blue) impede the delivery of chemotherapy to the cancer.

Pancreatic cancer is one of the deadliest forms of cancer, displaying only a 6 percent survival rate that has remained stable for decades. It is the cause of death for late celebrities Steve Jobs and Patrick Swayze, and about 40,000 people in the US die from this disease annually (1)....


UN makes population growth projections

World population projection through 2100. The shaded area marks all possible population numbers.
Source: Wikimedia Commons

According to a new statistical projection made by the United Nations (UN) and the University of Washington (UW), Seattle, the world population is likely to reach as many as 13 billion individuals by the end of this century (1). This recent analysis uses modern statistical methods instead of experts’ opinions...


Learning fear through odor

Learning fear through odor

Babies can get new phobias just by smelling the odor of their distressed mothers. A new study by the University of Michigan Medical School and New York University School of Medicine showed mother rats can teach new fears to their young (2). The concept that factors other than DNA can...


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Founded in 1998, the Dartmouth Undergraduate Journal of Science aims to increase scientific awareness within the Dartmouth community by providing an interdisciplinary forum for sharing undergraduate research and enriching scientific knowledge.

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