Another class of knights were granted land by the prince, allowing them the economic ability to serve the prince militarily. A Polish nobleman living at the time prior to the 15th century was referred to as a "rycerz", very roughly equivalent to the English "knight," the critical difference being the status of "rycerz" was almost strictly hereditary; the class of all such individuals was known as the "rycerstwo". Representing the wealthier families of Poland and itinerant knights from abroad seeking their fortunes, this other class of rycerstwo, which became the szlachta/nobility ("szlachta" becomes the proper term for Polish nobility beginning about the 15th century), gradually formed apart from Mieszko I's and his successors' elite retinues. This rycerstwo/nobility obtained more privileges granting them favored status. They were absolved from particular burdens and obligations under ducal law, resulting in the belief only rycerstwo (those combining military prowess with high/noble birth) could serve as officials in state administration.
WHat was a polish nobleman referred to as before the 15th century?
rycerz

West, alongside his mother, founded the "Kanye West Foundation" in Chicago in 2003, tasked with a mission to battle dropout and illiteracy rates, while partnering with community organizations to provide underprivileged youth access to music education. In 2007, the West and the Foundation partnered with Strong American Schools as part of their "Ed in '08" campaign. As spokesman for the campaign, West appeared in a series of PSAs for the organization, and hosted an inaugural benefit concert in August of that year.
In what month was the inaugural concert held for the "Ed in '08" campaign?
August

Thermal mass is any material that can be used to store heat—heat from the Sun in the case of solar energy. Common thermal mass materials include stone, cement and water. Historically they have been used in arid climates or warm temperate regions to keep buildings cool by absorbing solar energy during the day and radiating stored heat to the cooler atmosphere at night. However, they can be used in cold temperate areas to maintain warmth as well. The size and placement of thermal mass depend on several factors such as climate, daylighting and shading conditions. When properly incorporated, thermal mass maintains space temperatures in a comfortable range and reduces the need for auxiliary heating and cooling equipment.
What does thermal mass reduce the need for?
auxiliary heating and cooling equipment