In computerese, a "vaccine" is a program that seeks out & destroys these
A compass points toward this north pole
Varieties of these simple plants include red, brown, green & blue-green
Behaviorists & dogs drool over the work of this Russian physiologist
The most abundant metal on Earth, when it was discovered in 1820 it was worth more than gold
In botany it's the term used for the liquid in the stems & roots of plants & trees
This bacterium is responsible for many infections including strep throat & scarlet fever
The smallest of all constellations is Crux, also known by this name
From the Greek for "earthquake writer", this instrument records any Earth movement
This bluish glow is sometimes seen at the tips of tall objects during thunderstorms