Science

From physics, biology, and chemistry to astronomy and meteorology, learn how scientists gather evidence to investigate this world, and others.

  • Neurotransmitters are chemicals that connect neurons, allowing signals to be sent from one part of the body to another.
    What You Need to Know About Neurotransmitters
  • Blurred motion on city street, Hong Kong
    Déjà Vu: The Science Behind the Eerie Feeling of Familiarity
  • The minds of two people are represented by numbers and percents
    What Percentage of the Human Brain Is Used?
  • Young girl reading braille
    What Do Blind People See?
  • Reventador Volcano erupting at night
    How Does a Volcano Work?
  • Colorful female eye macro photography Eyesight Contact lens Vision Biometrics concept
    Impossible Colors and How to See Them
  • Smartphones can display 3D holograms.
    Introduction to Holography
  • Phrenology head
    How to Identify a Pseudoscience
  • dreamy scene with a child and oversized fish
    Everything You Need to Know About Lucid Dreaming
  • Yawning cat
    Why Are Yawns Contagious?
  • 1280px-Eyjafjallajokull-April-17.JPG
    Explore the Largest Known Volcanoes
  • In synesthesia, stimulation of one cognitive pathway causes a response in another pathway. For example, seeing a color might be associated with a flavor.
    What Is Synesthesia? Definition and Types
  • man with breathing mask and various medical wires
    The 8 Creepiest Science Experiments
  • Highway hypnosis is more common at night, yet can occur during the day too.
    Understanding Highway Hypnosis
  • The Whirlpool Galaxy
    All About the Whirlpool Galaxy
  • Cooling towers of a nuclear power plant Dukovany over the forest
    Facts About Plutonium (Pu or Atomic Number 94)
  • A man writes chemical formulas on a chalkboard
    What Are Acids and Bases?
  • 'Open' neon sign at night
    How Do Neon Lights Work?
  • In the Dutch West Indies, the water is so salty it crystallizes into salt. The ocean contains a lot of sodium and chloride, which make salt.
    Why Is the Ocean Salty?
  • Water boiling in a pot on a stove.
    Convection Currents in Science: Definition and Examples
  • Density column showing colored liquids with different densities.
    How to Calculate Density - Worked Example Problem
  • scientist pouring liquid into beaker
    How to Calculate the pH of a Weak Acid
  • Calculating mass percent composition
    How to Calculate Mass Percent Composition
  • Potassium ferricyanide
    How to Calculate Mass Percent
  • laser beam
    How to Solve an Energy From Wavelength Problem
  • How to make distilled water illustration
    How to Make Distilled Water at Home or While Camping
  • Touching Mercury: If you hold mercury in your hand, it feels heavy and liquid, but not wet.
    Have You Touched Liquid Mercury?
  • How to make a saline solution
    How to Make Saline Solution
  • The pH of lemon juice is around 2, making this fruit highly acidic
    Learn the pH of Common Chemicals
  • Compounds are weighed using scales to yield grams. It's often necessary to convert grams to moles for chemistry calculations.
    How to Convert Grams to Moles and Moles to Grams
  • Didymium is found in safety glasses uses for metalworking and glassblowing. The addition filters the blinding bright yellow light.
    Didymium Facts and Uses
  • Standard deviation and variation indicate how spread out data is from its average value.
    How to Calculate Population Standard Deviation
  • Aluminum alloys are used to make generators and car engines.
    Aluminum or Aluminium Alloys
  • Teenage girl in high school chemistry class experimenting
    Overview of High School Chemistry Topics
  • A woman smelling flowers
    Aroma Compounds and Their Odors
  • Cropped view of graduated pipette pipetting liquid into test tubes
    20 Practice Chemistry Tests
  • Filter paper being used to collect a sample during filtration
    Filtration Definition and Processes (Chemistry)
  • Bar chart arranged by batteries
    Equilibrium Constant of an Electrochemical Cell
  • Teaching a student about a chemistry model
    A List of Common General Chemistry Problems
  • Fuel tank
    Can Sugar in the Gas Tank Really Kill Your Engine?
  • When are Fahrenheit and Celsius equal
    At What Temperature Does Fahrenheit Equal Celsius?
  • Ice crystals, close-up
    Convert Temperature from Kelvin to Celsius and Back
  • Close up image of water.
    Water Properties and Facts You Should Know
  • Chemistry is full of precise definitions!
    A to Z Chemistry Dictionary
  • Writing chemistry equation on chalkboard
    Equilibrium Constants Practice Test
  • The adenosine triphosphate (ATP) molecule is formed by phosphorylation of adenine.
    What Is Phosphorylation and How Does It Work?
  • Liquid nitrogen is a good example of a cryogenic fluid.
    Understanding the Concept of Cryogenics
  • These engineers may look serious for the camera, but you can bet they know a lot of funny engineering jokes!
    Funny Engineering Jokes
  • A light microscope showing a histological preparation of the intestinal lining
    What Histology Is and How It's Used
  • precipitate
    How to Predict Precipitates Using Solubility Rules
  • Boy drinking rain water
    Is Rain Water Clean and Safe to Drink?
  • pouring liquid from one beaker into another
    How to Calculate Theoretical Yield of a Reaction
  • How to Convert Fahrenheit to Celsius
  • Pure platinum dissolving in aqua regia.
    How to Make Aqua Regia Acid Solution
  • Performing a sodium flame test
    How to Do Flame Tests for Qualitative Analysis
  • Assortment of flasks, graduated cylinders, and tissue culture plates.
    Overview of the Branches of Chemistry
  • Cubic meters and liters are units of volume
    Converting Cubic Meters to Liters
  • How to calculate percent error
    How to Calculate Percent Error
  • How to calculate normality
    How to Calculate Normality (Chemistry)
  • What Is Silicone?
  • Bust of Democritus by Orazio Marinali
    A Brief History of Atomic Theory
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