The term "2013 Nordic storms" generally refers to a series of severe weather events that affected the Nordic countries (Denmark, Finland, Iceland, Norway, and Sweden) during the winter of 2013. These storms were characterized by heavy snowfall, strong winds, and significant disruptions to transportation and daily life across the region. One of the most notable storms during this period was Storm "Hilde," which caused widespread damage and power outages in several areas.

The 2011 European floods were a series of flooding events that occurred in various parts of Europe during the summer of 2011, primarily in late May and early June. These floods were primarily caused by heavy rainfall and the melting of snow in the Alps and other mountainous regions. Key regions affected included: 1. **Central Europe**: Countries like Germany, Poland, and the Czech Republic experienced significant flooding.

The 2009 Great Britain and Ireland floods were significant weather-related events that primarily affected parts of England, Wales, and Ireland during the summer of that year, particularly in June and July. The flooding was caused by a combination of heavy rainfall and saturated ground conditions, which led to rivers overflowing and waterlogged areas. Key highlights of the event include: 1. **Heavy Rainfall**: The region experienced intense and prolonged rainfall, with some areas receiving several inches of rain over a short period.

The 1992 New Year's Day Storm, also known as the "Great New Year's Storm," was a significant winter storm that impacted parts of the northeastern United States and parts of Canada from December 31, 1991, to January 2, 1992. The storm brought heavy snowfall, strong winds, and blizzard conditions to many areas, leading to widespread disruptions.

The 1979 Fastnet Race was a notable yacht race that took place from August 11 to August 14, 1979, as part of the biennial Fastnet Race organized by the Royal Ocean Racing Club (RORC) in the United Kingdom. The race starts from Cowes on the Isle of Wight and involves a challenging course around the Fastnet Rock off the southwest coast of Ireland, before returning to Plymouth.

The 1968 Scotland storm, also known as the Great Storm of 1968, was a severe weather event that affected parts of the United Kingdom, particularly Scotland, in early January of that year. On January 5-6, 1968, Scotland experienced heavy snowfall, strong winds, and extremely low temperatures, disrupting transportation, causing power outages, and leading to significant disruptions across various sectors.

The 1928 Thames flood refers to a significant flood event that occurred in the United Kingdom, particularly affecting London and the surrounding areas along the River Thames. The flood took place in late December 1928, primarily on December 7th and 8th, following exceptionally heavy rainfall and high tides that overwhelmed the river's banks and flood defenses. The combination of these factors led to widespread flooding in several parts of London, causing extensive damage to homes, infrastructure, and businesses.

The 1872 Baltic Sea flood, also known as the Great Flood of 1872, was a significant and catastrophic weather event that affected the coastal regions around the Baltic Sea, particularly impacting areas in what is now Germany, Poland, and parts of the Scandinavian countries. The flood occurred during the night of October 30 to October 31, 1872, following a combination of heavy rainfall and strong winds, which led to a rapid rise in water levels.

The European windstorm season generally refers to the period during which significant windstorms occur across Europe, particularly in the North Atlantic region. This season typically runs from late autumn through winter, peaking from October to March. During this time, Europe can experience powerful storms characterized by intense winds, heavy rainfall, and severe weather events that can lead to disruptions, damage to property, flooding, and other impacts.

The European Journal of Physics is a peer-reviewed academic journal that publishes research articles, reviews, and educational resources primarily in the field of physics. Established in 1980, it is aimed at promoting physics education and disseminating findings in the discipline. The journal covers a wide range of topics within physics, including, but not limited to, classical mechanics, quantum mechanics, electromagnetism, thermodynamics, and various interdisciplinary applications.

EPL, which stands for "Europhysics Letters," is a scientific journal that publishes short letters and articles in the field of condensed matter physics and related areas. It is known for rapidly disseminating research findings, typically addressing important topics in physics and materials science. EPL covers a wide range of subjects, including statistical mechanics, quantum physics, nanotechnology, and interdisciplinary topics that involve physics principles. The journal is published by the European Physical Society (EPS) in collaboration with other scientific organizations.

The term "Zone theorem" can refer to different concepts depending on the field of study. In mathematics and related areas, it can involve concepts related to topology, geometry, or other branches. However, one possible interpretation could involve concepts within geometry, particularly in the context of tessellations or partitioning space.

The Tienstra formula is primarily used in the field of physics, particularly in the study of fluid dynamics and thermodynamics, and is associated with calculating the properties of fluids in various conditions. However, in a more general scientific context, "Tienstra formula" may not be widely recognized or may refer to a specific application or derivation by a researcher named Tienstra.

Thales's theorem is a fundamental result in geometry attributed to the ancient Greek mathematician Thales of Miletus.

Stewart's theorem is a result in geometry that relates the lengths of the sides of a triangle to a cevian, which is a line segment from one vertex of the triangle to the opposite side.

"Squaring the circle" is a classic problem in geometry that involves constructing a square with the same area as a given circle using only a finite number of steps with a compass and straightedge. More formally, it requires finding a square whose area is equal to πr², where r is the radius of the circle. The problem has its origins in ancient Greece, where it was one of the three famous problems of antiquity, alongside duplicating the cube and trisecting an angle.

Square trisection is a geometric construction problem where the goal is to divide a given square into three regions of equal area using only a finite number of straightedge and compass constructions. However, square trisection is known to be impossible using these classical tools alone. This result is part of the broader context of straightedge-and-compass constructions in which certain tasks cannot be achieved due to the limitations imposed by arithmetic and algebraic properties.

A special right triangle is a type of right triangle that has specific, well-defined angle measures and side lengths that can be derived from simple ratios. There are two primary types of special right triangles: 1. **45-45-90 Triangle**: - This triangle has two angles measuring 45 degrees and one right angle (90 degrees). - The sides opposite the 45-degree angles are of equal length.

Apollonius' problem involves finding a circle that is tangent to three given circles in a plane. This classic problem in geometry has several special cases depending on the configurations of the given circles. Here are some notable special cases: 1. **Tangency to Three Disjoint Circles**: If the three circles do not overlap and are positioned such that they are completely separated, there can be up to eight distinct circles that are tangent to all three given circles.

In two-dimensional geometry, rotations and reflections are two types of transformations that can change the position or orientation of a figure without altering its shape or size. ### Rotations A rotation involves turning a figure about a fixed point called the center of rotation. The rotation is described by an angle (in degrees or radians) and a direction (usually clockwise or counterclockwise): 1. **Center of Rotation**: The fixed point about which the figure is rotated.