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Electron shell

Polar covalent bond

Bohr atomic model

Basic components of an electrochemical cell.

An electron (e) in a solar cell interacting with light and dissipating excess energy is analogous to a child playing on a slide.

Earth's prebiotic and modern atmosphere

Rising air in an unstable atmosphere

Vegetation profile of a temperate deciduous forest.

Blower-scavenged, two-stroke-cycle engine with uniflow scavenging, displaying both upstroke and downstroke.

A tokamak is a toroidal magnetic confinement system used as a method of achieving fusion energy.

The Hardy-Weinberg Law applied to two alleles.

The steps involved in the engineering of a recombinant DNA molecule.

Compton effect

Four main types of estuaries: A) salt wedge estuary, B) partially mixed estuary, C) vertically homogeneous estuary, D) fjord.

Ionic bond

Coriolis force

Zonation of the ocean. Note that in the littoral zone the water is at the high-tide mark.

Apollo mission profile for a lunar landing and return, outlining the various stages along the mission.

Annual circulation patterns in a dimictic lake: stratification in the summer and complete overturn in the autumn and spring.

The components of a transmission electron microscope (TEM).

Receptor-mediated endocytosis enables cells to ingest molecules such as protein that are necessary for normal cell functioning.

The process of cell division by mitosis.

The endoplasmic reticulum plays an important role in the biosynthesis, processing, and transport of proteins and lipids.

Human arterial supply and venous drainage of the organs.

Average exchange of energy between the surface, atmosphere, and space, as percentages of incident solar radiation.

Diagram of a wave system depicting typical divergence and convergence distributions for non-tilting and tilting systems.

General patterns of atmospheric circulation over an idealized Earth with a uniform surface and the actual Earth.

The onset and retreat of the West African monsoon with respect to the timing of the direct rays of the sun.

Electromagnetic spectrum. The visible range (shaded portion) is shown enlarged on the right.

The Michelson interferometer measures the effect on the speed of light of the motion of the ether through which light travels.

Cross section of a V-type engine.

Automotive-type lead-acid battery, a storage battery that holds its charge for a long time and can be recharged.

Three types of natural selection, showing the effects of each on the distribution of phenotypes within a population.

Evolutionary history of the globin genes. The dots indicate the duplication of ancestral genes, giving rise to new gene lineage.

The diffusion of water across a semipermeable membrane.

Types of faulting in tectonic earthquakes.

Gyrotron, electrons from the cathode acquire cyclotron rotation in the cavity.

Changes in ion permeance underlying the action potential.

The components of a scanning electron microscope (SEM).

Phylogeny based on differences in the protein sequence of cytochrome c in organisms ranging from Neurospora mold to humans.

Diagram of a mammalian muscle spindle.

Cross section of a typical bomb calorimeter.

Stages in the process of meiosis, cell division among sexually reproducing organisms.

Transverse section of an artery.

The stages in the evolution of a wave (frontal) cyclone.

Horizontal divergence and convergence patterns associated with the polar-front jet.

Diagram of a two-cavity klystron, used as an amplifier and RF signal source at microwave frequencies, and also as an oscillator.

Elements of a magnetron, used to generate power for radar systems, microwave ovens, plasma screens, and linear accelerators.

Elements of the traveling-wave tube (TWT), used to amplify microwave signals over broad bandwidths.

Diesel engine equipped with a precombustion chamber.

Georges Leclanche's dry cell and its later variations, zinc chloride and alkaline cells, are batteries commonly used worldwide.

Modern version of the Leclanche cell. This heavy-duty zinc-carbon primary battery is a dry cell with an immobilized electrolyte.

Seismic ray types in Earth's interior from earthquake at F.

The journey of the Galileo spacecraft to Jupiter, highlighting major observations along the trajectory, as well as their dates.

Basic characteristics of orbits in which a satellite can be placed around Earth, categorized by inclination, shape and altitude.

Displacements in the Earth in four types of free vibrations.

The two sensory organs of balance: the cristae of the semicircular ducts and the maculae of the utricle and saccule.

A cutaway view shows how light passes through the lenses and prisms of binoculars.

The four strokes of a four-stroke cycle engine - intake, compression, power, and exhaust. Only the intake stroke delivers power.

Proton exchange membrane (PEM) fuel cell.

Diagram of an artificial pacemaker

Pay-off matrix showing bourgeois, or mixed attack/retreat behaviour, as the most stable strategy for a population.

U.S. space station Skylab (occupied 1973-74), shown with docked Apollo Command and Service modules.

The diffusion of potassium cations across a semipermeable membrane.

Diagram depicting the process of atoll formation. Atolls are formed from the remnant parts of sinking volcanic islands.

Differentiation of the external genitalia in the human embryo and fetus.

Fission bomb designs

Thermonuclear warhead

Schematic drawing of the structure of a typical bacterial cell of the bacillus type.

Vegetation profile of a desert.

Vegetation profile of tropical mountain lands.

The analysis of sound frequencies by the basilar membrane.

The weather model of meteorologist Edward Lorenz.

Light waves matching the orientation of the molecules of a polarizing filter are absorbed, reducing the intensity of the light.

The artery wall and the ultrastructure of the smooth muscle cells within it.

Vegetation profile of a grassland.

The gasoline carburetor is a device that introduces fuel into the airstream as it flows into the engine.

The sequence of events in a four-stroke diesel engine involves a single intake valve, fuel-injection nozzle, and exhaust valve.

Cutaway view of a typical construction of a miniature power cell, as in a zinc-silver oxide or zinc-mercuric oxide system.

A fuel cell (actually a group of cells) has essentially the same kinds of components as a battery.

A grid-connected solar cell system.

Four types of gasoline engines: opposed-piston engine, rotary engine, in-line engine, and V-type engine.

The Apollo program: the Saturn V launch vehicle and configurations of the spacecraft modules at launch and during the journey.

Uniformly accelerated motion; s = speed, a = acceleration, t = time, and v = velocity.

Approaching the speed of light, an object appears shorter, with a longer time interval, relative to its intervals when at rest.

Theoretical depiction of the movement of tectonic plates across Earth's surface.

Two types of pressure gauge: the U-tube manometer and the Bourdon-tube gauge.

Diagram of a human uterus during the fourth month of pregnancy.

Vegetation profile of a boreal forest. The tree layer consists mainly of conifers, and mosses are the predominant ground cover.

Space station Mir, after its completion in 1996, with the launch dates of each modular component shown.

Diagram showing a healthy heart valve compared with a diseased heart valve and an artificial heart valve.

Comparison of a normal heart to one with a ventricular septal defect

Diagram demonstrating the difference between a normal heart and a heart with an atrial septal defect

Annual temperature and precipitation patterns for several locations with different climatic conditions.

The surface reflectance differences between a pre-agricultural (forest) and a modern agricultural (patchwork heating) landscape.

Solar cells, whether used in a central power station, a satellite, or a calculator, have the same basic structure.

Nickel (hydroxide)-cadmium cell of “jelly roll” construction. This rechargable battery is commonly used in portable devices.

Cutaway view of an alkaline-manganese dioxide power cell.

An internal-combustion engine goes through four strokes: intake, compression, combustion (power), and exhaust.

Typical gasoline engine cooling system.

Typical gasoline engine lubrication system.

Generated by an undersea earthquake, a tsunami may propagate over open ocean waters before cresting and inundating a coastline.

Valley and mountain breezes

Relationships of endocrine glands, from the pituitary-hypothalamus system to the vertebrate endocrine glands and their hormones.

When monochromatic light passes through two narrow slits to illuminate a screen, it creates a pattern of bright and dark bands.

When monochromatic light passing through a single slit illuminates a screen, a characteristic diffraction pattern is observed.

Protein synthesis, artwork

In Ptolemy's geocentric model of the universe, the Sun, Moon, and each planet orbit a stationary Earth.

The 4-D space-time continuum is distorted in the vicinity of any mass, depending on the mass and the distance from the mass.

Cross section of a crystal microphone.

Pluto and the Kuiper belt

A heart-lung machine diverts blood from the body to an oxygenator, which removes CO2, adds O2, and returns the blood to the body

Seasons change because more direct sunlight falls on some parts of Earth than others at different times of the year.

矢印　循環　輪

矢印　循環　輪

矢印　循環　輪

U.S. space shuttle, composed of a winged orbiter, an external liquid-propellant tank, and two solid-fuel rocket boosters.

The first reduction for an n-person voting game theory, illustrating the strategies least suitable for each participant.

The relationship between hot springs and epithermal veins.

Female reproductive system, artwork

Gender characteristics, artwork

Muscle structure, artwork

Gate control theory of pain, artwork

Height of space from Earth, illustration

Cardiac stress test, artwork

Van Allen radiation belt

Atomic structure, illustration

Cross section comparing the left ventricular wall of normal heart to a left ventricular wall that has experienced hypertrophy.

Theoretical diagram showing the effects of an advancing tectonic plate on other adjacent, but stationary, tectonic plates.

Blood alcohol concentration

Blood alcohol concentration

The mechanical components of a compound microscope.

Image formation in a microscope, according to the Abbe theory.

A cross section of Earth's outer layers, from the crust through the lower mantle.

Moon interior

Asteroid distribution

Venus's middle and lower atmosphere

Pluto-Charon mutual eclipses

Jupiter's atmosphere

Near-Earth objects

Uranus's orbit

Speedometer

Spring balance

Nuclear blast and radiation effects

Viral transfer of bacterial DNA, artwork

An illustration representing Isaac Newton's equation for reconciling different frames of reference, x' = x - vt (t equals time).

Part of the elliptic paraboloid z = x2 + y2 which can be generated by rotating the parabola z = x2 (or z = y2) about the z-axis.

Weathering frees heavy minerals from their matrix, washing them down slope where flowing water forms them into placer deposits.

Mechanism of enzyme action, illustration

Height of space from Earth, illustration

Height of space from Earth, illustration

Height of space from Earth, illustration

Electrical conduction in the heart in healthy individuals is controlled by pacemaker cells in the sinoatrial node.

Double refraction showing two rays emerging when a single light ray strikes a calcite crystal at a right angle to one face.

Several points are labeled in a two-dimensional graph, known as the Cartesian plane.

The figure shows part of the graph of the polynomial equation y = 3x4 - 16x3 + 6x2 + 24x + 1.

Dice with graph arrow

Greenhouse effect on Earth

Simultaneous events may seem to coincide in time for one observer but not another due to differences in their spatial positions.

A illustration of the invariance of the speed of light, one of the postulates of Albert Einstein's theory of special relativity.

The Hawk-Dove model of game theory, illustrating the costs and benefits of fighting over resources.

Osteoarthritis of the knee, artwork

Internal structure of Mercury, illustration

Internal structure of Mercury, illustration

Internal structure of Earth, illustration

In the law of reflection, images are reflected from a smooth surface at the same angle (q2) as the incidence angle (q1).

Science book, conceptual artwork

シンプルな吹き出し素材のセット

シンプルな吹き出し素材のセット

シンプルな吹き出し素材のセット

Mass spectrometer and data chart, illustration

Role of serotonin in the digestive system

Role of serotonin in the digestive system

Animal cell structure

Economy map, illustration

Obtaining approximate measurements through the use of differentiation and integration.

Atomic model, illustration

Correct computer use position, artwork

In 1849, French physicist Armand Fizeau used this method to achieve the first terrestrial measurement of the speed of light.

Operating principle of a parallel-flow heat exchanger.

Chemical composition of nicotine, conceptual image

The circulation of nitrogen in various forms through nature, a process essential to life on Earth.

Pythagorean theorem, illustration

Birth of Galaxies

The age of Earth's oceanic crust, as measured in millions of years.

Placing of electrodes for ECG, artwork

Vector addition

Wormhole through hyperspace, artwork

Wet scrubber using a limestone slurry to remove sulfur dioxide from flue gas.

Subatomic particles, illustration

Drinking through a straw, illustration

Drinking through a straw, illustration

Graph with arrow sign

Bond formation in methane molecule

Bond formation in methane molecule

Bond formation in chlorine molecule

Bond formation in carbon dioxide molecule

Bond formation in carbon dioxide molecule

Bond formation in hydrogen molecule

Bond formation in hydrogen molecule