Popular Science Education

Calculation formula for the volume of a cylinder (3D schematic diagram of the calculation formula)

Formula for calculating the volume of a cube (3D schematic diagram of the formula)

Calculation formula for the volume of a rectangular prism (3D schematic diagram of the calculation formula)

Formula for calculating the volume of a ball (3D schematic diagram of the calculation formula)

Calculation formula for the volume of a circular cone (3D schematic diagram of the calculation formula)

Small intestine wall cross-section (microscopic 3D structural diagram)

The small intestine wall is divided from the inside out into mucosal layer, submucosal layer, muscular layer, and serosal layer. The small intestine, as an important organ in the human digestive system, has functions such as digestion, absorption, motility, and immunity.

Plant Cell Structure (Microscopic 3D Sectional View)

Passive continental margin (3D model of geomorphic structure)

From a geological perspective, the shallow sea area at the edge of the ocean is a continent submerged by seawater, known as the continental margin. The continental margin accounts for 15.3% of the total ocean area, with the main body being the continental shelf, followed by the continental slope and continental base. Passive continental margin, also known as Atlantic type continental margin. The so-called stable continental margin refers to a continental margin that has been in a relatively stable state for a long time in terms of structure. Its crust is a transition zone from oceanic crust to continental crust, with continents and oceans located within the same rigid lithospheric plate. It does not have a trench subduction zone, and its early splitting stage is located within the plate, followed by passive movement with the splitting plate, so there are no strong earthquakes.

Alveolar sac (medical 3D structural diagram)

Vortex Worm (3D Structural Diagram)

Vortex worms are flatworms belonging to the family Trichomycteridae in the order Trichomycteria. The body of the vortex worm is soft and flat, symmetrical on both sides, and divided into dorsal, ventral, and anterior posterior parts; The back is slightly convex, mostly black brown in color, the ventral color is light, the front end is triangular, with one ear protrusion on each side, two black eye points on the back of the head, and no anus; The ventral surface of the body is densely covered with cilia, and the movement of cilia and muscles can enable rotifers to swim and crawl on objects. It is named after its vortex like motion when it swings.

Muscle structure of left shoulder joint (medical 3D structural diagram)

The process of seed germination

Human sebaceous glands (medical 3D structural diagram)

Principles of Current Relay Physics (3D Experimental Animation)

The process of liver absorbing drugs (medical 3D schematic diagram)

The process of sedimentation on the continental margin

Halley's Comet

Halley's Comet (catalog number 1P/Halley) is a periodic comet that orbits the Sun once every 76.1 years and is visible to the naked eye. Named after British physicist Edmund Halley (1656-1742) who first measured its orbital data and successfully predicted its return time. The orbital period of Halley's Comet is 76-79 years, and its next perihelion will be on July 28, 2061. Halley's Comet is the first recorded periodic comet in human history, dating back to at least 240 BC or 466 BC. There are clear records of this comet appearing in China, ancient Babylon, and medieval Europe.

Geomorphic structure of Niujiaohu Lake

The Cowbow Lake is called the Cowbow Lake because its shape resembles that of a cow's yoke. They are mostly distributed in the the Middle and Lower Yangtze Valley Plain and the Northeast Plain. Generally, it is a freshwater lake with a crescent shaped shape, an open water surface, a developed economy around the lake, abundant cultural and historical relics, and high tourism value. Many large oxbow lakes in China are formed by natural levees blocking tributaries due to river fluctuations, such as Dongting Lake, Poyang Lake, Baiyangdian Lake, Hongze Lake, etc.

Cell lysosome (microscopic 3D perspective view)

Lysosomes are generally organelles in eukaryotic cells; A sac like structure with a single-layer membrane coating, with a size (mostly spherical under electron microscopy, but with the presence of olivine spheres) and a diameter of approximately 0.025-0.8 micrometers; Contains multiple hydrolytic enzymes, specifically designed to decompose various exogenous and endogenous macromolecular substances. Discovered by Belgian scholar Cristian de Duve (1917-2013) and others in mouse liver cells in 1955.