Physicists have emerged from various countries and time periods, contributing to the development of physics as a science. Below is a summary of notable physicists categorized by their nationality and the century in which they were most active: ### 17th Century - **Galileo Galilei** (Italy) - Often called the "father of modern science," he made significant contributions to motion and astronomy.

In ring theory, a **domain** is a specific type of ring that satisfies certain properties. More formally, a domain refers to an integral domain, which is defined as a commutative ring \( R \) with the following characteristics: 1. **Commutative**: The ring is commutative under multiplication, meaning for any \( a, b \in R \), \( ab = ba \).

Edward Samuel Ritchie is not a widely recognized figure, so it's possible that you may be referring to an individual who is not widely documented or may not have achieved significant prominence in historical or public records.

A "heeled bullet" refers to a type of bullet design where the rear part of the bullet, or the heel, is smaller in diameter than the part that is forward, or the body of the bullet. This design allows the bullet to fit snugly into a cartridge case while also allowing the larger diameter portion to engage the rifling of the barrel when fired. Heeled bullets were commonly used in some early cartridge designs, particularly in revolvers and black powder firearms.

Stoichiometry is a branch of chemistry that involves the calculation of reactants and products in chemical reactions. It is based on the conservation of mass, meaning that the total mass of the reactants must equal the total mass of the products in a chemical reaction. Stoichiometry allows chemists to predict the quantities of substances consumed and produced in a given reaction, based on balanced chemical equations.

IDisk was an online file storage service introduced by Apple in the late 1990s as part of its .Mac (later known as MobileMe) subscription service. It allowed users to store files online and access them from different devices, making it easier to share and sync data. Users could upload files, manage their storage, and share links to files with others. Over the years, the service evolved, and Apple eventually replaced .

Rublon is a cybersecurity company that specializes in providing multi-factor authentication (MFA) solutions. Their platform aims to enhance the security of user accounts and online transactions by requiring additional verification steps beyond just a username and password. Rublon's technology can be integrated into existing systems and applications, making it easier for organizations to protect sensitive data and reduce the risk of unauthorized access.