sunny morning environmental therapeutics

How does light work?

Light is a powerful antidepressant and is also the most powerful known zeitgeber (time-setter) for the internal biological clocks of the body. Surprisingly,...

What the Eye Tells the Brain

Light illuminates our surroundings and ensures that we can see fine details, recognize faces, discriminate ripe blackberries from those that need a little bit...

Vision

Human vision is a masterpiece: we can see in bright sunlight all the way down to dim starlight (this is called photopic-, mesopic-, and...

The long-term evolution of light sensitivity from single-cell organisms to humans: What we are missing now

Evolutionary biologists assume that life arose in the earth's oceans about 3.5 billion years ago. About a billion years later,...