*Ahem* from Genetics: Analysis of Genes and Genomes, Fifth Edition by Hartl and Jones:

Mutation - A heritable alteration in a gene or chromosome; also, the process by which such an alteration happens. Used incorrectly, but with increasing frequency, as a synonym for mutant, even in some excellent textbooks.

Mutant - Any heritable biological entity that differs from wild type, such as a mutant DNA molecule, mutant allele, mutant gene, mutant chromosome, mutant cell, mutant organism, or mutant heritable phenotype; also, a cell or organism in which a mutant allele is expressed.

From me:

Note that the word heritable is in there twice, even. Natural selection can't work its magic on a non-heritable trait. There's no "memory" in the sperm or egg for learned behavior - only for genetic alterations. Now, if these kids stand too close to the microwave, they might pick up a germ-line mutation for ambidextrous opposable thumbs or something, and that would be heritable, but I highly doubt that's happened.

Bottom line: the article screwed up, and genetics is cool.