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Learn about the decimal prefixes and units of time from picoseconds to years, and their applications in science and technology. A picosecond is one trillionth of a second, and it is used to measure the lifetime of a bottom quark or the period of a cesium-133 photon.
This is a list of time zones from release 2024a of the tz database, which partitions the world into regions with the same local clocks. The list shows the canonical, alternative, and standard names, the UTC offsets, and the time zone abbreviations for each zone.
Generation Z, also known as Zoomers, is the generation born from 1997 to 2012, after Millennials and before Generation Alpha. They are often called digital natives, as they grew up with access to the Internet and portable devices, and have different patterns of behavior, health, and education than previous generations.
Cognitive dissonance is the discomfort of holding two conflicting thoughts in your mind. Learn how it affects your emotions, behavior and choices, and see five everyday situations where it occurs.
Sleeping less than 7 hours per night can harm your health and mental performance. Learn why it's not possible to feel rested with less sleep, and how to improve your sleep quality and efficiency.
These 12 food additives are widely used to enhance the appearance, flavor or shelf life of foods. This article lets you know which are safe and which to avoid.
A standard score is the number of standard deviations by which a raw score is above or below the mean value of a population or a sample. Learn how to compute a standard score, also known as a z-score, and how it is used in statistics, testing, comparison and analysis.
Entropy is a measure of disorder that increases in isolated systems over time, according to the second law of thermodynamics. Learn how entropy distinguishes past from future, how it relates to cosmology and physics, and how it can be violated by chance or quantum effects.