Seedlings of American mahogany trees can only successfully establish themselves on open land, not in the shade of other trees. Logging practices are creating 'mahogany deserts' by replacing mature trees with seedlings, posing a threat to the species' long lifespan of up to 600 years.
A new study finds that first and second generation Japanese-American men living in Hawaii have a higher risk of Alzheimer's disease compared to European-ancestry Americans. The study also notes that rates of vascular dementia remain unchanged in this population.
Orthostatic intolerance affects at least 70% of returning astronauts due to the body's adaptation to weightlessness. Astronauts often struggle with standing and may have puffy faces and thin legs during and after space travel. Researchers are studying this condition to improve astronaut health for future long-duration missions.
A large study published in the New England Journal of Medicine found that patients with mild asthma do not need to take albuterol regularly. The study suggests that using albuterol only during symptoms can effectively manage asthma without negative consequences.