Counterfeiting-detecting pens are inexpensive special pens and markers containing the element:

Americans write more than 70 billion checks a year. What is the approximate value of illegitimate checks that are cashed each day?

If the refractive index of the liquid medium is different than the refractive index of the piece of glass, a halo-like ring appears around the edge of the glass.  This halo-like effect is called a:  

When certain types of sand are exposed to extremely high temperatures, such as lightning strikes or volcanic eruptions, which type of glass can be formed?

DNA in chromosomes is called

A fact is a statement or information that can be verified.

Narcotics are non-sleep-inducing drugs used to relieve pain.

Sand grains carried by water:

During which week of gestation are fingerprints formed?

Humans share common ancestors. Therefore the DNA STR profile of all humans is the same.