more wonders from the world of science

Lifescience.com:

Exposure to friendly soil bacteria could improve mood by boosting the immune system just as effectively as antidepressant drugs, a new study suggests.

Sanwiching a flash of light between two tones can cause the illusion of two flashes being seen.

More energy comes from the sun in the form of green light than red or blue, and yet green plants reflect this light away. A scientist theorizes that early plants used this green light, and so appeared purple.