Acoustics : The science of sound dealing with the production, effects, and transmission of sound waves through various mediums. Includes the effects of reflection, refraction, diffraction, absorption, and interference
Quartz : It is a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities. It is a mineral composed of the elements silicon and oxygen (silicon dioxide) that occurs in multiple forms.
Cross Pollination : Mixing the pollen of one flowering plant with another to create a hybrid. It is done by transfer of pollen from one flower to another of a different variety but of same species. Necessary for the fruit development of many plants.
Allele : Any of the alternative forms of a gene that may occur at a given gene locus. One of the variant forms of a gene at a particular locus, or location, on a chromosome. Different alleles produce variation in inherited characteristics such as hair color or blood type.
Optical Illusion : drawing or object that appears to have an effect that it does not really have, such as when a flat painting seems to have three-dimensional depth. When something appears different than it actually is. Example: Trompe de oil murals which "trick the eye" into thinking they are 3 dimensional, or when a ceiling appears higher than it is because of colors, etc. used.
Ovulation : The release of an egg (or eggs) from the ovary.
Aqua Regia : Aqua regia is a 3:1 mixture of hydrochloric acid and nitric acid. Aqua regia is used to test gold and platinum; it is just about one of the few substances that can dissolve gold and platinum.