A 620 THz light is used to provide a sense of calming focus at night.  What is the wavelength of this light, in nm?

According to the lastest research on gut-microbial ecology stated in “Our Microbes, Ourselves”,

The first abrasive used to finish the acrylic on the denture base is:

A classical sonata typically consists of a shorter section of exposition, followed by a longer section of development and recapitulation.  If a sonata is 152 bars long in total (exposition + development/recapitulation), around how many bars into the song would you expect the transition from exposition to development?

The pueblo cultures were located primarily in what is today the American Southwest.

According to the article, Our Microbes, Ourselves, pharmaceutical companies could

What does the letter “B” in “BULL” rule stand for?

The height of a new temple is planned to be 128 feet.  If the temple is proportioned according to the Golden Ratio and its width is greater than its height, what will be the width?

The stippled appearance of the attached gingiva is created by:

Phagocytosis is best defined as _____.