The bicycle is a human-powered, two-wheeled land vehicle that is used for transport and recreation. It consists of a frame, two wheels, one pedal, and a chain connected to the pedals and to the rear wheel. The bicycle is the most efficient means of human-powered transportation, in terms of the amount of energy that a person must expend to travel a given distance. It is also the safest form of passenger transportation when compared to automobiles and motorcycles. People use bikes for exercise, as a mode of transportation, to haul cargo, for recreational purposes, and in many other ways. A bicycle is a very complex machine, and it is important to understand how a bicycle works before riding one.

The history of the bicycle began in 1868 when Frenchman Baron Georges-Édouard von Grateau introduced the velocipede. This two-wheeled machine was more efficient than walking, but it was difficult to balance and control. Various improvements were made, and by the end of the velocipede craze in America in 1871, the dwarf ordinary had replaced it as the dominant bike. The new design addressed the problems of stability and steering by lowering the front wheel diameter and positioning the seat further back, but it still required a person to both pedal and steer, which was not ideal for long-distance travel. Improvements included a larger rear wheel, a more comfortable saddle, better quality tires and bearings, and standardized parts.

After 1900, there was a boom in bicycle production, and the bike gained popularity worldwide. The most significant technical advancement was multiple-speed gearing. After the invention of hub gears by William Reilly in 1896, and derailleur gears in the 1920s, the bicycle became a very efficient mode of transportation.

A bicycle can be equipped with accessories to make it more comfortable and functional, including a suspension seat post and fork, handlebar grips, and bicycle lights. People may add auxiliary saddles or pegs to the frame to allow additional riders, or they can carry luggage, tools, and other supplies on trailers attached to the rear of the bicycle. People often attach baskets or bags to the handlebars for carrying items, and they may wear a helmet to protect themselves from falls and collisions.

Riding a bicycle requires a great deal of skill and attention to safety. It is possible to perform tricks on a bicycle, such as performing a stoppie or endo, which involves using the rider’s legs to generate enough force to lift the front wheel off the ground while maintaining control and balance on the bicycle. The bicycle’s design allows it to be ridden in an upright position with the feet off the ground, and some cyclists prefer this style of riding. The rider’s knees should be slightly bent to keep the body stable, and it is often helpful to wear padded clothing to prevent injury if the rider falls. Pedals can be equipped with toe clips or clipless pedals that enable the rider to engage and disengage the pedals with ease.

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The game of go is a strategic board game for two players. Traditionally, it is played with 181 black and 180 white “go-ishi” (flat, round stones) on a square wooden board checkered by 19 vertical and 19 horizontal lines to form 361 intersections; each player conquers territory by completely enclosing vacant points with boundaries made of their own stones. The first to occupy all the vacant points wins the game. Go is a complex and challenging strategy game that has been studied for centuries, but remains an exciting and stimulating game even for a modern day casual player.

GOES provides vital data and images to NOAA weather forecasters, scientists, and other customers. GOES satellites monitor Earth’s surface and atmosphere, detect storms and other atmospheric phenomena, provide ocean and coastal surface observations, and help support scientific research, numerical weather prediction model development and testing, and space environment monitoring.

The GOES satellite series is comprised of four operational satellites (GOES-R, GOES-S, GOES-T, and GOES-18), a backup satellite (GOES-B), and the upcoming GOES-U. GOES satellites are designed to operate in geosynchronous orbit 22,236 miles above the Earth’s equator, where they remain fixed over one geographic area on the Earth, continuously scanning the Earth’s surface and atmosphere.

Among the primary payload instruments on each satellite is the Advanced Baseline Imager (ABI). ABI images the Earth’s surface and atmosphere with three times more spectral channels, five times greater resolution, and three to seven times faster scanning than previous GOES instrumentation. ABI’s data is combined to produce imagery that approximates what the human eye would see from space, a product known as GeoColor. ABI also includes the Extreme Ultraviolet and X-ray Irradiance Sensor, or EXIS, which tracks solar flares that could disrupt communications systems, reduce navigational accuracy, and interfere with electrical power grids on Earth.

In a study of the Amazon rainforest, scientists have used GOES-18 to collect new data every 10-15 minutes for entire days, allowing them to better understand seasonality in the region’s cloud cover and vegetation, which they hope will help improve climate models. Previously, this work had relied on polar-orbiting satellites that pass over the Amazon only once or twice per day.

The GOES-U satellite has undergone extensive prelaunch testing, including thermal vacuum tests in which the satellite was placed in a giant chamber and subjected to temperatures ranging from soaring to minus 67 degrees Fahrenheit to simulate the extreme temperatures at launch and space conditions. In addition to providing ten-minute full disk imagery, the satellite will provide the NWS with enhanced coverage of hazardous weather situations, such as volcanic ash emissions and wildfires. GOES-U is scheduled to launch in 2024.