Can color affect the way we feel? Scientists say yes. Learn why McDonald’s uses yellow in its packaging and why stop signs are red. Science Trek is available to stream on pbs.org and the free PBS App, ...

Light is more than what we see. The Sun sends out a number of waves of light in different wavelengths. Find out about wavelengths and the electromagnetic spectrum. Science Trek is available to stream ...

Veronica Then wore an electroencephalogram, or EEG, cap and stood in front of a black curtain with a white square placed behind her like a target. Studio lights beamed down from the ceiling as a panel ...

The human eye perceives color using three types of cones, but no natural light can stimulate just the the cones associated with medium-wavelength light in the visible spectrum. A new tool, nicknamed ...