About ______ percent of U.S. adults report having experienced suicidal thoughts

What color would you report seeing if a researcher projects the longest wavelength in the visible spectrum on a screen?

a) red b) blue c) yellow d) violet

The drawing known as "The wife and the mother-in-law" is an example of

A) a reversible figure B) the Muller-Lyer illusion C) depth perception D) texture gradient