For the first time, scientists have traced the north-south shifts of the northern-most edge of the tropics back 800 years. The movement of the tropical boundary affects the locations of Northern Hemisphere deserts including the Sonoran, Mohave and Saharan. The Earth's climate system affects the movement of the tropics, which have been expanding since the 1970s. The research team found that in the past, periods of tropical expansion coincided with severe droughts.
Humans not only relish the sweet, savory and saltiness of foods, but they are influenced by the environment in which they eat. Food scientists used virtual reality to show how people's perception of real food can be altered by their surroundings.
Researchers have taken an important step toward what may become a new approach to restore the hearing loss. In a new study scientists have been able to regrow the sensory hair cells found in the cochlea -- a part of the inner ear -- that converts sound vibrations into electrical signals and can be permanently lost due to age or noise damage.