Before more precise absolute dating tools were possible, researchers used a variety of comparative approaches called relative dating.These methods — some of which are still used today — provide only an approximate spot within a previously established sequence: Think of it as ordering rather than dating.These changes typically occur so slowly that they are barely detectable over the span of a human life, yet even at this instant, the Earth's surface is moving and changing.
“Science is often presented as something that is ‘other,’ that it is for only certain types of people,” says Olivia Koski, operations director for Guerilla Science. Human beings are scientists from birth, in the sense that we all have a curiosity to explore the world around us and learn from our experiences.” Koski and her colleagues at Guerilla Science have been experimenting with this concept in the U. Past events have included “The Science of Disco,” which provided insight into how our brains behave when we dance, and “The Fire Organ,” featuring a huge, unorthodox pipe organ that uses flames to reveal the shapes of sound waves.
At Mysteryland, participants could play the Fire Organ and participate in the “Flavor Feast,” a series of taste-based experiments designed to disrupt expectations about certain foods.
By having singles send in saliva samples, the site facilitates a laboratory analysis of each person's immune system type and, using this data, claims to create optimized “physical chemistry” or "sexual chemistry" between people based on the sweaty T-shirt study, a pattern, discovered in 1995, which finds that people are most attracted to the smell of people who have the most-dissimilar immune system.
 The site was conceived by Holzle, a long-time internet site dater, after watching a TV discussion on the findings of the sweaty T-shirt study.
Sometimes only one method is possible, reducing the confidence researchers have in the results. “They’re based on ‘it’s that old because I say so,’ a popular approach by some of my older colleagues,” says Shea, laughing, “though I find I like it myself as I get more gray hair.” Kidding aside, dating a find is crucial for understanding its significance and relation to other fossils or artifacts.
Methods fall into one of two categories: relative or absolute.A fossil can be studied to determine what kind of organism it represents, how the organism lived, and how it was preserved.However, by itself a fossil has little meaning unless it is placed within some context.The theory of desired dissimilar immune system matching can be quantified according to markers on a person’s major histocompatibility complex (MHC), a large gene region that controls the immune system response, and postulates that couples attracted to this type of scent owing to the result that a resultant child would create a more robust immune system, more defensive against a greater variety of pathogens.In the mid 1970s, MHC-dissimilar tendency matching was shown to be the case for mice (and later for other animals such as fish) and in 1995 Swiss biologist Claus Wedekind, creator of the sweat T-shirt study, proved that the pattern holds for humans.The age of the fossil must be determined so it can be compared to other fossil species from the same time period.