Phân tử chất béo

Ba phân tử axit béo bão hòa liên kết với một phân tử glycerol.

Phân tử dầu

Chất béo trung tính chứa axit béo không bão hòa là chất lỏng ở nhiệt độ phòng.

Cấu trúc bậc hai của protein

Các chuỗi polypeptide bao gồm các axit amin và có thể xuất hiện ở dạng cấu trúc xoắn alpha hoặc cấu trúc gấp beta.

Hot air balloon

A hot air balloon is a balloon aircraft which is lifted by hot air.

Xúc xắc

Xúc xắc thông thường có thể được sử dụng để giải các bài tập thống kê và xác suất.

How does it work? - Record player

This animation demonstrates the mechanism and operation of record players.


The fastest track-based means of urban transport.

How does it work? - Air conditioner

An air conditioner cools the air inside by drawing heat away and releasing it outside.

USS Ohio (US, 1979)

Nuclear propulsion was first used by the US Navy for powering submarines in the mid-20th century.

String quartet

A string quartet consists of four string players, it appeared in the late 18th century.


The piano is one of the most popular instruments in the world. It is a chordophone which produces sounds mechanically.

Relief map of China

An introduction to the relief and hydrography of China.

Common European viper

A species of venomous snakes widespread in Europe. Its bite is rarely fatal to humans.

USS Missouri (US, 1944)

The battleship USS Missouri, first deployed during WWII was also deployed in the Gulf War.


The bell is a percussion instrument and an idiophone. Many types of bells exist.


Oases are areas in deserts where water is available.

Ames room

An Ames room is a distorted room that is used to create an optical illusion.

Mid-latitude cyclone and anticyclone

Cyclones are large areas of circulating air with clouds and precipitation being formed in its centre.


The ancestors of Arachnida and Crustacea belonged to the class Trilobita.

Underground waters

Groundwater and aquifers are types of underground waters.

Added to your cart.