Radiometric dating works by determining the ratio of the number of isotopes of an element and the number of isotopes the element it turns into over time. Since the rate at which certain elements decay and turn into diffe... More »

Relative dating and radiometric dating are used to determine age of fossils and geologic features, but with different methods. Relative dating uses observation of location within rock layers, while radiometric dating use... More »

The Tagged dating website requires each user to post a profile with a biography. After that, users meet by searching and rating each others profiles. Users can also meet in chat rooms, purchase gifts for each other using... More » Health

The isotopes of an element differ from each other in their mass numbers and the number of neutrons they contain. All of the isotopes of an element, however, contain the same number of protons, which is equal to that elem... More »

All isotopes of a given element must share the same atomic number, which equals the number of protons. An isotope is denoted by its atomic number in the lower left-hand corner next to its chemical symbol and its mass num... More »

A food calorie counter works by logging the number of calories in servings of different foods, thereby helping you calculate your overall calorie intake over a period of time. Free online calorie counters are available o... More » Health Nutrition & Diets Calories in Food

Carbon-14 dating uses the ratio of radioactive carbon-14 to non-radioactive carbon-12 to determine if the ratio is the same as in living organisms, or if it is lower, indicating that the carbon-14 has decayed during a pe... More »