So there was no hope of comparing genetic variations in old and new human tissue.

The pollen provides a record of vegetational composition going back thousands of years, and with it Dr. Cole was able to compare natural variations in ancient vegetation patterns - caused by such factors as climatic change and the natural evolution of ecosystems - with variations caused by post-settlement human disturbance.

They compared geographic variations in tool use related to the processing of Neesia fruit.

GWAS allows researchers to examine genetic variations across an individual's entire genome, and compare variations between affected and unaffected groups.

As a shopper who looks at five wallets of the same color and style to compare variations in grain and coloring before choosing one, I thought I should take a look at the leather from which my shoes would be cut.

Whereas the comparative method compares variations between languages-such as in sets of cognates-under the assumption that they descend from a single proto-language, internal reconstruction compares variant forms within a single language under the assumption that they descend from a single, regular form.

One study has compared the number of insurgent attacks in Iraq to the number of "anti-resolve" statements in the US media, the release of public opinion polls, and geographic variations in access to international media by Iraqis.

However, there is a simpler way of comparing variations in readers with variations in readings.