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Some isotopes of certain elements are unstable; they can spontaneously change into another kind of atom in a process called “radioactive decay.” Since this process presently happens at a known measured rate, scientists attempt to use it like a “clock” to tell how long ago a rock or fossil formed.

Artificial intelligence can be used to analyse high-resolution digital X-ray images of paintings, providing more insight for conservators and those restoring classic works of art. Legend states that after the Greek army defeated the invading Persian forces near the city of Marathon in 490 B. E., the courier Pheidippides ran to Athens to report the victory and then immediately ...These cosmic rays collide with atoms in the atmosphere and can cause them to come apart.Neutrons that come from these fragmented atoms collide with C to be useful in age estimates.Atoms are made up of much smaller particles called protons, neutrons, and electrons.Protons and neutrons make up the center (nucleus) of the atom, and electrons form shells around the nucleus.

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